Add PHP 8 support

Author: austincarpenter

composer.json

@@ -12,7 +12,7 @@
     "homepage": "https://github.com/codinglabsau/laravel-roles",
     "keywords": ["Laravel", "Roles"],
     "require": {
-        "php" : "^7.3",
+        "php" : "^7.3|^8.0",
         "illuminate/support": "^6.0|^7.0|^8.0"
     },
     "require-dev": {