Update branch alias in 1.0

composer.json

@@ -54,7 +54,8 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.18.x-dev"
+            "dev-master": "2.0.x-dev",
+            "1.0": "1.18.x-dev"
         }
     },
     "scripts": {