Update readme-vars.yml

Author: dkaygithub

readme-vars.yml

@@ -72,6 +72,12 @@ app_setup_block: |
   db.getSiblingDB("MONGO_DBNAME_stat").createUser({user: "MONGO_USER", pwd: "MONGO_PASS", roles: [{role: "dbOwner", db: "MONGO_DBNAME_stat"}]});
   ```
 
+  If you are using the Mongo v4 (the latest which does not require AVX):
+
+  ```js
+  db.getSiblingDB("MONGO_DBNAME").createUser({user: "MONGO_USER", pwd: "MONGO_PASS", roles: [{role: "dbOwner", db: "MONGO_DBNAME"}, {role: "dbOwner", db: "MONGO_DBNAME_stat"}]});
+  ```
+
   Being sure to replace the placeholders with the same values you supplied to the Unifi container, and mount it into your *mongodb* container.
 
   For example: