Fix CI issues

Author: marcrohloff

CHANGELOG.md

@@ -1,6 +1,6 @@
 ### Next Release
 
-* [#406](https://github.com/ruby-grape/grape-entity/pull/406): Handle symbol-to-proc wrappers (`&:method_name`) where the method uses `delegate` or `method_missing`
+* [#406](https://github.com/ruby-grape/grape-entity/pull/406): Handle symbol-to-proc wrappers (`&:method_name`) where the method uses `delegate` or `method_missing` - [@marcrohloff](https://github.com/marcrohloff).
 
 #### Features
 

CONTRIBUTING.md

@@ -44,7 +44,7 @@ Implement your feature or bug fix.
 
 Ruby style is enforced with [Rubocop](https://github.com/bbatsov/rubocop), run `bundle exec rubocop` and fix any style issues highlighted.
 
-Make sure that `bundle exec rake` completes without errors.
+Make sure that `bundle exec rake` and `rubocop` completes without errors.
 
 #### Write Documentation
 

spec/grape_entity/entity_spec.rb

@@ -436,7 +436,7 @@ def delegate_object
 
             private
 
-            def respond_to_missing?(method, include_private = false)
+            def respond_to_missing?(method, include_private = false) # rubocop:disable Style/OptionalBooleanParameter
               method.to_sym == :method_using_missing ||
                 super
             end