Add support for Laravel 8

Author: reinink

composer.json

@@ -25,7 +25,7 @@
         }
     },
     "require": {
-        "laravel/framework": "^5.4|^6.0|^7.0"
+        "laravel/framework": "^5.4|^6.0|^7.0|^8.0"
     },
     "require-dev": {
         "orchestra/testbench": "~3.0"