Add rubocop-rails

Author: lcreid

.rubocop.yml

@@ -1,5 +1,7 @@
 # Taken from: https://github.com/mattbrictson/rails-template/blob/master/rubocop.yml.tt
 # Modified for demo app in `demo/` directory.
+require: rubocop-rails
+
 AllCops:
   DisplayCopNames: true
   DisplayStyleGuide: true

Gemfile

@@ -9,8 +9,8 @@ gem "rails", "~> 6.0.0.rc1"
 group :development do
   gem "chandler", ">= 0.7.0"
   gem "htmlbeautifier"
-  gem "rubocop", require: false
-  gem "sass-rails"
+  gem "rubocop-rails", require: false
+  gem "sassc"
   gem "webpacker", ">= 4.0.0.rc.3"
 end
 

test/gemfiles/5.0.gemfile

@@ -5,7 +5,7 @@ gemspec path: "../../"
 gem "rails", "~> 5.0.0"
 
 group :development do
-  gem "rubocop", require: false
+  gem "rubocop-rails", require: false
 end
 
 group :test do

test/gemfiles/5.1.gemfile

@@ -5,7 +5,7 @@ gemspec path: "../../"
 gem "rails", "~> 5.1.0"
 
 group :development do
-  gem "rubocop", require: false
+  gem "rubocop-rails", require: false
 end
 
 group :test do

test/gemfiles/5.2.gemfile

@@ -5,7 +5,7 @@ gemspec path: "../../"
 gem "rails", "~> 5.2.0"
 
 group :development do
-  gem "rubocop", require: false
+  gem "rubocop-rails", require: false
 end
 
 group :test do

test/gemfiles/6.0.gemfile

@@ -5,7 +5,7 @@ gemspec path: "../../"
 gem "rails", "~> 6.0.0.rc1"
 
 group :development do
-  gem "rubocop", require: false
+  gem "rubocop-rails", require: false
   gem "sass-rails"
   gem "webpacker", ">= 4.0.0.rc.3"
 end