[composer] make twig-bundle require twig-bridge

src/Symfony/Bundle/TwigBundle/composer.json

@@ -18,6 +18,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "twig/twig": ">=1.1"
+        "twig/twig": ">=1.1",
+        "symfony/twig-bridge": ">=2.0"
     }
 }