updated README

Author: vyuldashev

README.md

@@ -9,7 +9,7 @@ Require this package in your composer.json and run composer update (IMPORTANT! D
 
 After composer update is finished you need to add ServiceProvider to your `providers` array in `app.php`:
 
-	'FintechFab\LaravelQueueRabbitMQ\LaravelQueueRabbitMQServiceProvider',
+	FintechFab\LaravelQueueRabbitMQ\LaravelQueueRabbitMQServiceProvider::class,
 
 Add these lines to your `app/config/queue.php` file to `connections` array: