Laravel 5.8 compatibility

Author: Ilya Sakovich

composer.json

@@ -6,7 +6,7 @@
     "license": "MIT",
     "require": {
         "php": ">=7.1",
-        "laravel/framework": "5.5.*|5.6.*|5.7.*"
+        "laravel/framework": "5.5.*|5.6.*|5.7.*|5.8.*"
     },
     "autoload": {
         "psr-4": {