Gemfile in stripe-3.9.0 vs Gemfile in stripe-3.9.1

@@ -1,9 +1,10 @@
 source "https://rubygems.org"
 
 gemspec
 
 group :development do
+  gem "coveralls", require: false
   gem "mocha", "~> 0.13.2"
   gem "rake"
   gem "shoulda-context"
   gem "test-unit"
   gem "timecop"