Update readme

Author: tomas-novotny

README.md

@@ -29,7 +29,7 @@
 composer require inspirum/mcrouter
 ```
 
-This package supports Laravel 5.3 or later (including Laravel 6).
+This package supports Laravel 5.3 or later (including Laravel 6/7).
 
 For Laravel 5.4 and below it necessary to register the service provider in `config/app.php`.