Fixed branch alias (KnpLabs#667)

GrahamCampbell · Nyholm · commit 719a37ed1eda · 2017-12-28T07:05:34.000+01:00
diff --git a/composer.json b/composer.json
@@ -44,7 +44,7 @@
     "prefer-stable": true,
     "extra": {
         "branch-alias": {
-            "dev-master": "2.6.x-dev"
+            "dev-master": "2.7.x-dev"
         }
     }
 }
