Add PHP 8.0 support (#1)

Author: Pezhvak

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": "^7.1"
+        "php": "^7.1|^8.0"
     },
     "require-dev": {
         "illuminate/support": "^5.6|^6.0|^7.0|^8.0",