Added a branch alias

Author: GrahamCampbell

composer.json

@@ -17,5 +17,10 @@
         "psr-4": {
             "Barryvdh\\Queue\\": "src/"
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "0.3-dev"
+        }
     }
 }