Update readme

Author: tomas-novotny

README.md

@@ -29,17 +29,17 @@
 composer require inspirum/mcrouter
 ```
 
-It necessary to register the service provider in `config/app.php` right after `CacheServiceProvider`.
+For Laravel 5.4 and below it necessary to register the service provider in `config/app.php`.
 
 ```php
 'providers' => [
   // ...
   Illuminate\Cache\CacheServiceProvider::class,
-  Inspirum\Mcrouter\Providers\McrouterServiceProvider::class,
-  // ...
 ]
 ```
 
+On newer versions Laravel will automatically register via [Package Discovery](https://laravel.com/docs/master/packages#package-discovery).
+
 
 ### Config Files