More files to include in Rubocop

Author: alexeyr

.rubocop.yml

@@ -13,7 +13,9 @@ AllCops:
   Include:
     - '**/Rakefile'
     - '**/config.ru'
-    - 'Gemfile'
+    - '**/Gemfile'
+    - '**/Gemfile.*'
+    - '**/*.gemspec'
     - '**/*.rb'
     - '**/*.rake'