upgrade laravel version

Author: arnidan

composer.json

@@ -8,7 +8,7 @@
   "require": {
     "php": "^7.1.3",
     "monolog/monolog": "^1.23",
-    "laravel/framework": "5.6.*|5.7.*|5.8.*"
+    "laravel/framework": "5.6.*|5.7.*|5.8.*|6.0.*"
   },
   "minimum-stability": "dev",
   "prefer-stable": true,