fix style

config/broadcasting.php

@@ -37,7 +37,7 @@ return [
             'app_id' => env('PUSHER_APP_ID'),
             'options' => [
                 'encrypted' => true,
-                'cluster' => env('PUSHER_APP_CLUSTER')
+                'cluster' => env('PUSHER_APP_CLUSTER'),
             ],
         ],