Merge pull request #84 from rubygems/add-logger

Added `logger` to test dependency

Author: hsbt

Gemfile

@@ -5,6 +5,7 @@ gemspec
 gem "webrick", "~> 1.7"
 gem "minitest", "~> 5.7"
 gem "rdoc", "< 7", ">= 4.0"
+gem "logger", "~> 1.7"
 gem "builder", "~> 3.2"
 gem "rubygems-generate_index"
 gem "rake"