Update rubocop gem to v0.19.0

Author: jhx

logger-jquery-rails.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rails', '~> 3.2.14'
   spec.add_development_dependency 'rake', '~> 10.1.0'
   spec.add_development_dependency 'rspec-rails', '~> 2.14.0'
-  spec.add_development_dependency 'rubocop', '~> 0.18.1'
+  spec.add_development_dependency 'rubocop', '~> 0.19.0'
   spec.add_development_dependency 'semantic', '~> 1.3.0'
   spec.add_development_dependency 'sqlite3', '~> 1.3.8'
 end