[composer] make doctrine dbal and orm recommended by doctrine-bundle

src/Symfony/Bundle/DoctrineBundle/composer.json

@@ -18,8 +18,11 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "doctrine/orm": ">=2.0",
         "symfony/doctrine-bridge": ">=2.0",
         "symfony/doctrine-abstract-bundle": ">=2.0"
+    },
+    "recommend": {
+        "doctrine/dbal": ">=2.0",
+        "doctrine/orm": ">=2.0"
     }
 }