Support php 8.0

Author: exileed

.github/workflows/main.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ 73, 74 ]
+        php: [ 73, 74, 80 ]
     steps:
       - name: Checkout
         uses: actions/checkout@v2

composer.json

@@ -18,7 +18,7 @@
     }
   ],
   "require": {
-    "php": "~7.3",
+    "php": "~7.3 || ~8.0",
     "guzzlehttp/guzzle": "~6.0 || ^7.0",
     "illuminate/support": "^5.0 || ^6.0 || ^7.0 || ^8.0",
     "league/event": "^2.1"