Add rubocop-rails-omakase gem

bin/rubocop

@@ -8,14 +8,12 @@
 # this file is here to facilitate running it.
 #
 
-require 'pathname'
-ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile',
-                                           Pathname.new(__FILE__).realpath)
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
-bundle_binstub = File.expand_path('bundle', __dir__)
+bundle_binstub = File.expand_path("bundle", __dir__)
 
 if File.file?(bundle_binstub)
-  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+  if File.read(bundle_binstub, 300).include?("This file was generated by Bundler")
     load(bundle_binstub)
   else
     abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
@@ -23,7 +21,7 @@ Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this
   end
 end
 
-require 'rubygems'
-require 'bundler/setup'
+require "rubygems"
+require "bundler/setup"
 
-load Gem.bin_path('rubocop', 'rubocop')
+load Gem.bin_path("rubocop", "rubocop")