diff --git a/package-lock.json b/package-lock.json
index 2c77fce..4f63e26 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,6 +4,160 @@
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           "version": "3.0.0",
           "bundled": true,
           "dev": true
         },
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-          "bundled": true,
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-                "amdefine": "1.0.1"
-              }
-            }
-          }
-        },
-        "has-ansi": {
-          "version": "2.0.0",
+        "hasha": {
+          "version": "3.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "is-stream": "^1.0.1"
           }
         },
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-          "bundled": true,
-          "dev": true
-        },
         "hosted-git-info": {
-          "version": "2.5.0",
+          "version": "2.7.1",
           "bundled": true,
           "dev": true
         },
@@ -2110,8 +2129,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "once": "1.4.0",
-            "wrappy": "1.0.2"
+            "once": "^1.3.0",
+            "wrappy": "1"
           }
         },
         "inherits": {
@@ -2119,16 +2138,8 @@
           "bundled": true,
           "dev": true
         },
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-          "requires": {
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-          }
-        },
         "invert-kv": {
-          "version": "1.0.0",
+          "version": "2.0.0",
           "bundled": true,
           "dev": true
         },
@@ -2137,80 +2148,15 @@
           "bundled": true,
           "dev": true
         },
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-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "number-is-nan": "1.0.1"
+            "builtin-modules": "^1.0.0"
           }
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         "is-fullwidth-code-point": {
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@@ -2220,245 +2166,166 @@
           "bundled": true,
           "dev": true
         },
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@@ -2467,11 +2334,11 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "brace-expansion": "1.1.8"
+            "brace-expansion": "^1.1.7"
           }
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           "dev": true
         },
@@ -2481,30 +2348,34 @@
           "dev": true,
           "requires": {
             "minimist": "0.0.8"
+          },
+          "dependencies": {
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+              "version": "0.0.8",
+              "bundled": true,
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+            }
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           "dev": true
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-            "validate-npm-package-license": "3.0.1"
-          }
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@@ -2512,7 +2383,7 @@
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           "dev": true,
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+            "path-key": "^2.0.0"
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@@ -2520,26 +2391,12 @@
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+            "wrappy": "1"
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@@ -2547,8 +2404,8 @@
           "bundled": true,
           "dev": true,
           "requires": {
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-            "wordwrap": "0.0.3"
+            "minimist": "~0.0.1",
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@@ -2557,60 +2414,76 @@
           "dev": true
         },
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-          "version": "2.1.0",
+          "version": "3.1.0",
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           "dev": true
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           "bundled": true,
           "dev": true
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           "bundled": true,
           "dev": true,
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+            "graceful-fs": "^4.1.15",
+            "hasha": "^3.0.0",
+            "lodash.flattendeep": "^4.4.0",
+            "release-zalgo": "^1.0.0"
           }
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+        "parse-json": {
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           "bundled": true,
           "dev": true,
           "requires": {
-            "pinkie-promise": "2.0.1"
+            "error-ex": "^1.3.1",
+            "json-parse-better-errors": "^1.0.1"
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+        "path-exists": {
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+          "bundled": true,
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+        },
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           "bundled": true,
@@ -2621,169 +2494,66 @@
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-          "dev": true
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-            "pify": "2.3.0",
-            "pinkie-promise": "2.0.1"
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-          "bundled": true,
-          "dev": true
-        },
-        "pinkie": {
-          "version": "2.0.4",
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           "bundled": true,
           "dev": true
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-          }
-        },
         "pkg-dir": {
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-                "pinkie-promise": "2.0.1"
-              }
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+            "find-up": "^3.0.0"
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           "version": "1.0.2",
           "bundled": true,
           "dev": true
         },
-        "randomatic": {
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+        "pump": {
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           "bundled": true,
           "dev": true,
           "requires": {
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+            "end-of-stream": "^1.1.0",
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           }
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+          "version": "3.0.0",
           "bundled": true,
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           "requires": {
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-            "normalize-package-data": "2.4.0",
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-          "dev": true
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+          "version": "4.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
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+            "find-up": "^3.0.0",
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-          "bundled": true,
-          "dev": true
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-        "repeating": {
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+        "release-zalgo": {
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           "bundled": true,
           "dev": true,
           "requires": {
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+            "es6-error": "^4.0.1"
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@@ -2797,29 +2567,25 @@
           "dev": true
         },
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-          "version": "2.0.0",
+          "version": "4.0.0",
           "bundled": true,
           "dev": true
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-        "right-align": {
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+        "rimraf": {
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           "bundled": true,
           "dev": true,
-          "optional": true,
           "requires": {
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+            "glob": "^7.1.3"
           }
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+        "safe-buffer": {
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           "bundled": true,
-          "dev": true,
-          "requires": {
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+          "dev": true
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-          "version": "5.4.1",
+          "version": "5.6.0",
           "bundled": true,
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         },
@@ -2833,7 +2599,7 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "shebang-regex": "1.0.0"
+            "shebang-regex": "^1.0.0"
           }
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         "shebang-regex": {
@@ -2846,44 +2612,44 @@
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-            "os-homedir": "1.0.2",
-            "rimraf": "2.6.2",
-            "signal-exit": "3.0.2",
-            "which": "1.3.0"
+            "foreground-child": "^1.5.6",
+            "mkdirp": "^0.5.0",
+            "os-homedir": "^1.0.1",
+            "rimraf": "^2.6.2",
+            "signal-exit": "^3.0.2",
+            "which": "^1.3.0"
           }
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         "spdx-correct": {
-          "version": "1.0.2",
+          "version": "3.1.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-license-ids": "1.2.2"
+            "spdx-expression-parse": "^3.0.0",
+            "spdx-license-ids": "^3.0.0"
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-        "spdx-expression-parse": {
-          "version": "1.0.4",
+        "spdx-exceptions": {
+          "version": "2.2.0",
           "bundled": true,
           "dev": true
         },
+        "spdx-expression-parse": {
+          "version": "3.0.0",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "spdx-exceptions": "^2.1.0",
+            "spdx-license-ids": "^3.0.0"
+          }
+        },
         "spdx-license-ids": {
-          "version": "1.2.2",
+          "version": "3.0.3",
           "bundled": true,
           "dev": true
         },
@@ -2892,124 +2658,77 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "is-fullwidth-code-point": "2.0.0",
-            "strip-ansi": "4.0.0"
-          },
-          "dependencies": {
-            "ansi-regex": {
-              "version": "3.0.0",
-              "bundled": true,
-              "dev": true
-            },
-            "is-fullwidth-code-point": {
-              "version": "2.0.0",
-              "bundled": true,
-              "dev": true
-            },
-            "strip-ansi": {
-              "version": "4.0.0",
-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "ansi-regex": "3.0.0"
-              }
-            }
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^4.0.0"
           }
         },
         "strip-ansi": {
-          "version": "3.0.1",
+          "version": "4.0.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "ansi-regex": "2.1.1"
+            "ansi-regex": "^3.0.0"
           }
         },
         "strip-bom": {
-          "version": "2.0.0",
+          "version": "3.0.0",
           "bundled": true,
-          "dev": true,
-          "requires": {
-            "is-utf8": "0.2.1"
-          }
+          "dev": true
         },
         "strip-eof": {
           "version": "1.0.0",
           "bundled": true,
           "dev": true
         },
-        "supports-color": {
-          "version": "2.0.0",
-          "bundled": true,
-          "dev": true
-        },
         "test-exclude": {
-          "version": "4.1.1",
+          "version": "5.1.0",
           "bundled": true,
           "dev": true,
           "requires": {
-            "arrify": "1.0.1",
-            "micromatch": "2.3.11",
-            "object-assign": "4.1.1",
-            "read-pkg-up": "1.0.1",
-            "require-main-filename": "1.0.1"
+            "arrify": "^1.0.1",
+            "minimatch": "^3.0.4",
+            "read-pkg-up": "^4.0.0",
+            "require-main-filename": "^1.0.1"
           }
         },
-        "to-fast-properties": {
-          "version": "1.0.3",
-          "bundled": true,
-          "dev": true
-        },
-        "trim-right": {
-          "version": "1.0.1",
-          "bundled": true,
-          "dev": true
-        },
         "uglify-js": {
-          "version": "2.8.29",
+          "version": "3.4.9",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "source-map": "0.5.7",
-            "uglify-to-browserify": "1.0.2",
-            "yargs": "3.10.0"
+            "commander": "~2.17.1",
+            "source-map": "~0.6.1"
           },
           "dependencies": {
-            "yargs": {
-              "version": "3.10.0",
+            "source-map": {
+              "version": "0.6.1",
               "bundled": true,
               "dev": true,
-              "optional": true,
-              "requires": {
-                "camelcase": "1.2.1",
-                "cliui": "2.1.0",
-                "decamelize": "1.2.0",
-                "window-size": "0.1.0"
-              }
+              "optional": true
             }
           }
         },
-        "uglify-to-browserify": {
-          "version": "1.0.2",
+        "uuid": {
+          "version": "3.3.2",
           "bundled": true,
-          "dev": true,
-          "optional": true
+          "dev": true
         },
         "validate-npm-package-license": {
-          "version": "3.0.1",
+          "version": "3.0.4",
           "bundled": true,
           "dev": true,
           "requires": {
-            "spdx-correct": "1.0.2",
-            "spdx-expression-parse": "1.0.4"
+            "spdx-correct": "^3.0.0",
+            "spdx-expression-parse": "^3.0.0"
           }
         },
         "which": {
-          "version": "1.3.0",
+          "version": "1.3.1",
           "bundled": true,
           "dev": true,
           "requires": {
-            "isexe": "2.0.0"
+            "isexe": "^2.0.0"
           }
         },
         "which-module": {
@@ -3017,12 +2736,6 @@
           "bundled": true,
           "dev": true
         },
-        "window-size": {
-          "version": "0.1.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
         "wordwrap": {
           "version": "0.0.3",
           "bundled": true,
@@ -3033,18 +2746,39 @@
           "bundled": true,
           "dev": true,
           "requires": {
-            "string-width": "1.0.2",
-            "strip-ansi": "3.0.1"
+            "string-width": "^1.0.1",
+            "strip-ansi": "^3.0.1"
           },
           "dependencies": {
+            "ansi-regex": {
+              "version": "2.1.1",
+              "bundled": true,
+              "dev": true
+            },
+            "is-fullwidth-code-point": {
+              "version": "1.0.0",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "number-is-nan": "^1.0.0"
+              }
+            },
             "string-width": {
               "version": "1.0.2",
               "bundled": true,
               "dev": true,
               "requires": {
-                "code-point-at": "1.1.0",
-                "is-fullwidth-code-point": "1.0.0",
-                "strip-ansi": "3.0.1"
+                "code-point-at": "^1.0.0",
+                "is-fullwidth-code-point": "^1.0.0",
+                "strip-ansi": "^3.0.0"
+              }
+            },
+            "strip-ansi": {
+              "version": "3.0.1",
+              "bundled": true,
+              "dev": true,
+              "requires": {
+                "ansi-regex": "^2.0.0"
               }
             }
           }
@@ -3055,17 +2789,17 @@
           "dev": true
         },
         "write-file-atomic": {
-          "version": "1.3.4",
+          "version": "2.4.2",
           "bundled": true,
           "dev": true,
           "requires": {
-            "graceful-fs": "4.1.11",
-            "imurmurhash": "0.1.4",
-            "slide": "1.1.6"
+            "graceful-fs": "^4.1.11",
+            "imurmurhash": "^0.1.4",
+            "signal-exit": "^3.0.2"
           }
         },
         "y18n": {
-          "version": "3.2.1",
+          "version": "4.0.0",
           "bundled": true,
           "dev": true
         },
@@ -3075,61 +2809,31 @@
           "dev": true
         },
         "yargs": {
-          "version": "10.0.3",
-          "bundled": true,
-          "dev": true,
-          "requires": {
-            "cliui": "3.2.0",
-            "decamelize": "1.2.0",
-            "find-up": "2.1.0",
-            "get-caller-file": "1.0.2",
-            "os-locale": "2.1.0",
-            "require-directory": "2.1.1",
-            "require-main-filename": "1.0.1",
-            "set-blocking": "2.0.0",
-            "string-width": "2.1.1",
-            "which-module": "2.0.0",
-            "y18n": "3.2.1",
-            "yargs-parser": "8.0.0"
-          },
-          "dependencies": {
-            "cliui": {
-              "version": "3.2.0",
-              "bundled": true,
-              "dev": true,
-              "requires": {
-                "string-width": "1.0.2",
-                "strip-ansi": "3.0.1",
-                "wrap-ansi": "2.1.0"
-              },
-              "dependencies": {
-                "string-width": {
-                  "version": "1.0.2",
-                  "bundled": true,
-                  "dev": true,
-                  "requires": {
-                    "code-point-at": "1.1.0",
-                    "is-fullwidth-code-point": "1.0.0",
-                    "strip-ansi": "3.0.1"
-                  }
-                }
-              }
-            }
+          "version": "12.0.5",
+          "bundled": true,
+          "dev": true,
+          "requires": {
+            "cliui": "^4.0.0",
+            "decamelize": "^1.2.0",
+            "find-up": "^3.0.0",
+            "get-caller-file": "^1.0.1",
+            "os-locale": "^3.0.0",
+            "require-directory": "^2.1.1",
+            "require-main-filename": "^1.0.1",
+            "set-blocking": "^2.0.0",
+            "string-width": "^2.0.0",
+            "which-module": "^2.0.0",
+            "y18n": "^3.2.1 || ^4.0.0",
+            "yargs-parser": "^11.1.1"
           }
         },
         "yargs-parser": {
-          "version": "8.0.0",
+          "version": "11.1.1",
           "bundled": true,
           "dev": true,
           "requires": {
-            "camelcase": "4.1.0"
-          },
-          "dependencies": {
-            "camelcase": {
-              "version": "4.1.0",
-              "bundled": true,
-              "dev": true
-            }
+            "camelcase": "^5.0.0",
+            "decamelize": "^1.2.0"
           }
         }
       }
@@ -3145,6 +2849,47 @@
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
       "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
     },
+    "object-keys": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/object-keys/-/object-keys-1.0.12.tgz",
+      "integrity": "sha512-FTMyFUm2wBcGHnH2eXmz7tC6IwlqQZ6mVZ+6dm6vZ4IQIHjs6FdNsQBuKGPuUUUY6NfJw2PshC08Tn6LzLDOag==",
+      "dev": true
+    },
+    "object.assign": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/object.assign/-/object.assign-4.1.0.tgz",
+      "integrity": "sha512-exHJeq6kBKj58mqGyTQ9DFvrZC/eR6OwxzoM9YRoGBqrXYonaFyGiFMuc9VZrXf7DarreEwMpurG3dd+CNyW5w==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.2",
+        "function-bind": "^1.1.1",
+        "has-symbols": "^1.0.0",
+        "object-keys": "^1.0.11"
+      }
+    },
+    "object.entries": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/object.entries/-/object.entries-1.1.0.tgz",
+      "integrity": "sha512-l+H6EQ8qzGRxbkHOd5I/aHRhHDKoQXQ8g0BYt4uSweQU1/J6dZUOyWh9a2Vky35YCKjzmgxOzta2hH6kf9HuXA==",
+      "dev": true,
+      "requires": {
+        "define-properties": "^1.1.3",
+        "es-abstract": "^1.12.0",
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3"
+      },
+      "dependencies": {
+        "has": {
+          "version": "1.0.3",
+          "resolved": "https://registry.npmjs.org/has/-/has-1.0.3.tgz",
+          "integrity": "sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==",
+          "dev": true,
+          "requires": {
+            "function-bind": "^1.1.1"
+          }
+        }
+      }
+    },
     "once": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
@@ -3590,6 +3335,12 @@
         "is-plain-obj": "1.1.0"
       }
     },
+    "source-map": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+      "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+      "dev": true
+    },
     "spdx-correct": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
@@ -3649,14 +3400,6 @@
       "resolved": "https://registry.npmjs.org/strict-uri-encode/-/strict-uri-encode-1.1.0.tgz",
       "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM="
     },
-    "string_decoder": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
-      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
-      "requires": {
-        "safe-buffer": "5.1.1"
-      }
-    },
     "string-width": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
@@ -3667,6 +3410,14 @@
         "strip-ansi": "4.0.0"
       }
     },
+    "string_decoder": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.0.3.tgz",
+      "integrity": "sha512-4AH6Z5fzNNBcH+6XDMfA/BTt87skxqJlO0lAh3Dker5zThcAxG6mKz+iGu308UKoPPQ8Dcqx/4JhujzltRa+hQ==",
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "stringstream": {
       "version": "0.0.5",
       "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
@@ -3751,6 +3502,12 @@
         "os-tmpdir": "1.0.2"
       }
     },
+    "to-fast-properties": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+      "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "2.3.4",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
@@ -3760,6 +3517,12 @@
         "punycode": "1.4.1"
       }
     },
+    "trim-right": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/trim-right/-/trim-right-1.0.1.tgz",
+      "integrity": "sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=",
+      "dev": true
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
diff --git a/package.json b/package.json
index e33e2b6..09a5f4e 100644
--- a/package.json
+++ b/package.json
@@ -41,6 +41,6 @@
     "eslint-config-airbnb-base": "^13.0.0",
     "eslint-plugin-import": "^2.9.0",
     "mocha": "^5.0.1",
-    "nyc": "^12.0.1"
+    "nyc": "^13.2.0"
   }
 }