Support for Laravel 8 (overtrue#390)

Author: jxlwqq

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "illuminate/container": "^5.1 || ^6.0 || ^7.0",
+        "illuminate/container": "^5.1 || ^6.0 || ^7.0 || ^8.0",
         "overtrue/wechat": "^4.0"
     },
     "autoload": {