fixed horizon link

Author: rok

README.md

@@ -8,7 +8,7 @@ Running with redis you can configure your `QUEUE_CONNECTION` environment variabl
 
 The default queue name in laravel is called `default`. So we configured the `QUEUE_NAME` environment variable to this value.
 
-If you want to use [Laravel Horizon](https://laravel.com/docs/5.5/horizon) then you have to set the environment `LARAVEL_HORIZON` to `true`. By default it is `false`.
+If you want to use [Laravel Horizon](https://laravel.com/docs/horizon) then you have to set the environment `LARAVEL_HORIZON` to `true`. By default it is `false`.
 
 
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