Update composer.json to allow Laravel 6.0

Update composer.json to allow Laravel 6.0

Author: lesichkovm

composer.json

@@ -17,6 +17,6 @@
         "files": ["src/AdvancedRoute.php"]
     },
      "require": {
-        "laravel/framework": "5.*"
+        "laravel/framework": "5.*|6.*"
     }
 }