update docs

README.md

@@ -43,7 +43,7 @@ finally register the plugin on `/app/Providers/Filament/AdminPanelProvider.php`
 you can use this package by use this helper function
 
 ```php
-settings($key, 'default value');
+setting($key, 'default value');
 ```
 
 to register new setting to the hub page you can use Facade class on your provider like this