Merge branch 'new-rubocop'

Author: gjtorikian

.rubocop.yml

@@ -1,5 +1,5 @@
 inherit_gem:
-  rubocop-github:
+  rubocop-standard:
     - config/default.yml
 
 Style/StringLiterals:

graphql-docs.gemspec

@@ -38,6 +38,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'pry-byebug', '~> 3.6'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rubocop'
-  spec.add_development_dependency 'rubocop-github'
+  spec.add_development_dependency 'rubocop-performance'
+  spec.add_development_dependency 'rubocop-standard'
   spec.add_development_dependency 'webmock', '~> 2.3'
 end