add dotenv-sync package

Author: oberest

composer.json

@@ -15,7 +15,8 @@
     "vlucas/phpdotenv": "~2.2",
     "dmstr/yii2-adminlte-asset": "~2.6",
     "justcoded/yii2-settings": "*",
-    "justcoded/yii2-rbac": "*"
+    "justcoded/yii2-rbac": "*",
+    "justcoded/dotenv-sync": "*"
   },
   "require-dev": {
     "yiisoft/yii2-debug": "~2.0.0",