Bump package to version 2.0.0

Author: vuongxuongminh

composer.json

@@ -41,7 +41,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.0-dev"
+            "dev-master": "2.x-dev"
         },
         "laravel": {
             "aliases": {