Merge pull request #634 from stiig/patch-1

Remove confusing with README.md file

Author: koic

docs/modules/ROOT/pages/installation.adoc

@@ -11,5 +11,5 @@ or if you use bundler put this in your `Gemfile`
 
 [source,ruby]
 ----
-gem 'rubocop-rails'
+gem 'rubocop-rails', require: false
 ----