Reverts r21305 (#35207).

.rubocop_todo.yml is broken.


git-svn-id: http://svn.redmine.org/redmine/trunk@21306 e93f8b46-1217-0410-a6f0-8f06a7374b81

Gemfile

@@ -106,7 +106,7 @@ group :test do
   # RuboCop
   gem 'rubocop', '~> 1.23.0'
   gem 'rubocop-performance', '~> 1.12.0'
-  gem 'rubocop-rails', '~> 2.12.4'
+  gem 'rubocop-rails', '~> 2.11.0'
 end
 
 local_gemfile = File.join(File.dirname(__FILE__), "Gemfile.local")