Updated branch aliases

- dev-master => 2.9-dev
- dev-develop => 3.0-dev

Author: weierophinney

composer.json

@@ -65,8 +65,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.8-dev",
-            "dev-develop": "2.9-dev"
+            "dev-master": "2.9-dev",
+            "dev-develop": "3.0-dev"
         }
     },
     "autoload-dev": {