Check the new class instead of its superclass to see if it responds t…

…o the value method

lib/graphql/schema/loader.rb

@@ -108,7 +108,7 @@ def define_type(type, type_resolver)
                   enum_value["name"],
                   description: enum_value["description"],
                   deprecation_reason: enum_value["deprecationReason"],
-                  value_method: GraphQL::Schema::Enum.respond_to?(enum_value["name"].downcase) ? false : nil
+                  value_method: self.respond_to?(enum_value["name"].downcase) ? false : nil
                 )
               end
             end