Support Laravel 8 (#391)

Author: milewski

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "illuminate/container": "^5.1 || ^6.0 || ^7.0 || ^8.0",
-        "overtrue/wechat": "^4.0"
+        "overtrue/wechat": "^4.0 || ^5.0"
     },
     "autoload": {
         "psr-4": {