chore(package): update jsdom to version 12.2.0

Closes #37

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "gemini": "^4.4.4",
     "husky": "^0.14.3",
     "istanbul": "^0.4.5",
-    "jsdom": "^9.8.3",
+    "jsdom": "^12.2.0",
     "jsdom-global": "^2.1.0",
     "mocha": "^3.1.2",
     "react": "^15.3.0",