Gemfile in terraforming-0.9.1 vs Gemfile in terraforming-0.10.0

@@ -11,7 +11,9 @@
     gem "listen", "~> 3.1.0"
   else
     gem "listen", "< 3.1.0"
   end
 
+  gem "rubocop"
+
   gem "terminal-notifier-guard"
 end