Merge pull request #325 from cakephp/correct-alias

dev-master should be aliased to 3.0.x-dev, not 2.2.x-dev

Author: Mark S.

composer.json

@@ -46,7 +46,7 @@
 	},
 	"extra": {
 		"branch-alias": {
-			"dev-master": "2.2.x-dev"
+			"dev-master": "3.0.x-dev"
 		}
 	}
 }