Gemfile in mongoid-history-0.4.0 vs Gemfile in mongoid-history-0.4.1

@@ -1,12 +1,16 @@
-source "http://rubygems.org"
-
-gem "easy_diff"
-gem "mongoid", "~> 3.0"
-gem "activesupport"
-
-group :test do
-  gem "rspec", ">= 2.11.0"
-  gem "yard"
-  gem "bundler", ">= 1.0.0"
-  gem "jeweler"
-end
+source "http://rubygems.org"
+
+gem "easy_diff"
+gem "mongoid", ">= 3.0"
+gem "activesupport"
+
+group :test do
+  gem "rspec", ">= 2.11.0"
+  gem "bundler", ">= 1.0.0"
+end
+
+group :development do
+  gem 'rubocop', '~> 0.15.0'
+  gem "yard"
+  gem "jeweler"
+end