Added branch alias for 0.2.x-dev

This will allow dependants to depend on `^0.2` with dev stability and get the latest BC-breaking updates.

Author: XedinUnknown

composer.json

@@ -42,7 +42,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-develop": "0.1.x-dev"
-        }
+            "dev-develop": "0.1.x-dev",
+            "0.2.x": "0.2.x-dev"
+        },
     }
 }