Gemfile in uglifier-2.7.2 vs Gemfile in uglifier-3.0.0

@@ -1,9 +1,5 @@
 source "https://rubygems.org"
 
 gemspec
 
-if RUBY_VERSION >= '1.9'
-  gem 'rubocop', '~> 0.28.0', :group => [:development]
-else
-  gem 'execjs', '~> 2.0.2'
-end
+gem 'rubocop', '~> 0.37.2', :group => [:development]