Gemfile in partially_useful-0.2.1 vs Gemfile in partially_useful-0.2.2

@@ -1,5 +1,9 @@
 source "https://rubygems.org"
 
 gemspec
 
-gem "byebug"
+group :rails_4_2 do
+  gem "responders", '~> 2.0'
+end
+
+gem "byebug", platforms: :ruby_20