Delegate to Roar's represent w/o options argument

Small change that seems to grant us all of the niceties of Roar's represent for free

Author: jcwilk

lib/grape/roar/decorator.rb

@@ -4,7 +4,7 @@ module Grape
   module Roar
     class Decorator < ::Roar::Decorator
       def self.represent(object, _options = {})
-        new(object)
+        super(object)
       end
     end
   end

lib/grape/roar/representer.rb

@@ -2,13 +2,14 @@ module Grape
   module Roar
     module Representer
       def self.included(base)
+        super
+        base.send(:include, Roar::Representer)
         base.extend(ClassMethods)
       end
 
       module ClassMethods
         def represent(object, _options = {})
-          object.extend self
-          object
+          super(object)
         end
       end
     end