Add DEFAULT_FILE_NAME to readme.md

Author: hamidafghan

README.md

@@ -23,9 +23,9 @@ You can publish the config file with:
 
 ```
 php artisan vendor:publish --provider="Dcblogdev\DbSync\DbSyncServiceProvider" --tag="config"
-``` 
+```
 
-## .env 
+## .env
 
 Set the remote database credentials in your .env file
 
@@ -59,6 +59,8 @@ REMOTE_IMPORT_FILE=true
 
 Set a comma seperate list of tables NOT to export in `REMOTE_DATABASE_IGNORE_TABLES`
 
+To generate the SQL with a custom name `DEFAULT_FILE_NAME`
+
 ## Usage
 
 To export a remote database to OVERRIDE your local database by running: