Unpin rubocop gem to be compatible with latest rake version

aerostitch · aerostitch · commit e29e22e299eb · 2017-01-24T15:52:03.000-08:00
diff --git a/skeleton/Gemfile b/skeleton/Gemfile
@@ -8,7 +8,7 @@ group :test do
   gem 'puppetlabs_spec_helper'
   gem 'metadata-json-lint'
   gem 'rspec-puppet-facts'
-  gem 'rubocop', '0.33.0'
+  gem 'rubocop'
   gem 'simplecov', '>= 0.11.0'
   gem 'simplecov-console'
 
