Fix handling of HTTP status codes from routes

Author: milgner

lib/grape-swagger/endpoint.rb

@@ -220,7 +220,7 @@ def response_object(route)
     end
 
     def http_codes_from_route(route)
-      if route.http_codes.is_a?(Array) && route.http_codes.any? { |code| code[:code].between?(200, 299) }
+      if route.http_codes.is_a?(Array) && route.http_codes.any? { |code| code.first.between?(200, 299) }
         route.http_codes.clone
       else
         success_codes_from_route(route) + (route.http_codes || route.options[:failure] || [])