added a missing use statement

src/Symfony/Bundle/FrameworkBundle/HttpKernel.php

@@ -12,6 +12,7 @@
 namespace Symfony\Bundle\FrameworkBundle;
 
 use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;