add branch aliases

Author: robocoder

composer.json

@@ -22,5 +22,12 @@
     },
     "keywords": [
         "bdd", "behat", "phpunit", "code", "coverage", "testing"
-    ]
+    ],
+    "minimum-stability": "dev",
+    "extra": {
+        "branch-alias": {
+            "dev-master": "3.0.x-dev",
+            "dev-2.5": "2.5.x-dev"
+        }
+    }
 }