Gemfile in dox-1.2.0 vs Gemfile in dox-1.3.0

@@ -3,6 +3,6 @@
 # Specify your gem's dependencies in dox.gemspec
 gemspec
 
 rails_version = ENV['RAILS_VERSION'] || '5.0.1'
 
-gem 'rails', "~> #{rails_version}"
+gem 'activesupport', "~> #{rails_version}"