ResponseInterface is now factory

Fixes zendframework/zend-expressive#569

Author: michalbundyra

src/ResponsePrototypeTrait.php

@@ -33,7 +33,7 @@ protected function getResponsePrototype(ContainerInterface $container) : Respons
             ));
         }
         return $container->has(ResponseInterface::class)
-            ? $container->get(ResponseInterface::class)
+            ? $container->get(ResponseInterface::class)()
             : new Response();
     }
 }