laravel 8 supporot (#24)

Author: swilla

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": "^7.1",
         "guzzlehttp/guzzle": "~6.0",
-        "illuminate/support": "5.7.* || 5.8.* || 6.* || 7.*",
+        "illuminate/support": "5.7.* || 5.8.* ||^6.0 || ^7.0 || ^8.0",
         "symfony/dotenv": "^4.2 || ^5.1"
     },
     "require-dev": {