Gemfile in contracts-0.14.0 vs Gemfile in contracts-0.15.0

@@ -4,10 +4,10 @@
 
 group :test do
   gem "rspec"
   gem "aruba"
   gem "cucumber", "~> 1.3.20"
-  gem "rubocop", "~> 0.29.1", :platform => [:ruby_20, :ruby_21, :ruby_22, :ruby_23]
+  gem "rubocop", "~> 0.29.1" if RUBY_VERSION >= "2"
 end
 
 group :development do
   gem "relish"
   gem "method_profiler"