Add support for rubocop-graphql (#278)

Author: rubendinho

Gemfile

@@ -8,6 +8,7 @@ gem "parser"
 gem "pry", require: false
 gem "rubocop", "1.10.0", require: false
 gem "rubocop-i18n", require: false
+gem "rubocop-graphql", require: false
 gem "rubocop-minitest", require: false
 gem "rubocop-performance", require: false
 gem "rubocop-rails", require: false

Gemfile.lock

@@ -52,6 +52,8 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.4.1)
       parser (>= 2.7.1.5)
+    rubocop-graphql (0.9.0)
+      rubocop (>= 0.87, < 2)
     rubocop-i18n (3.0.0)
       rubocop (~> 1.0)
     rubocop-minitest (0.9.0)
@@ -92,6 +94,7 @@ DEPENDENCIES
   rake
   rspec
   rubocop (= 1.10.0)
+  rubocop-graphql
   rubocop-i18n
   rubocop-minitest
   rubocop-performance