Update branch aliasses with new versions (#599)

Author: stayallive

composer.json

@@ -61,7 +61,9 @@
     },
     "extra": {
         "branch-alias": {
+            "dev-3.x": "3.x-dev",
             "dev-master": "2.x-dev",
+            "dev-1.x": "1.x-dev",
             "dev-0.x": "0.x-dev"
         },
         "laravel": {