Exclude dummy app from RuboCop (#93)

* Exclude dummy app from RuboCop

* Explicit vendor too

Author: exoego

.rubocop.yml

@@ -2,6 +2,9 @@ inherit_from: .rubocop_todo.yml
 
 AllCops:
   TargetRubyVersion: 2.5
+  Exclude:
+    - 'spec/rails/**/*'
+    - 'vendor/**/*'
 
 Style/TrailingCommaInHashLiteral:
   EnforcedStyleForMultiline: consistent_comma