Merge pull request #1 from frontkom/php8-support

Add support for php8

Author: oleksandr-yushchenko

composer.json

@@ -10,7 +10,7 @@
     }
   ],
   "require": {
-    "php": "^7.1.3",
+    "php": "^7.1.3 || ^8.0",
     "ext-json": "*",
     "guzzlehttp/guzzle": "^6.3 || ^7.0",
     "nesbot/carbon": "^1.26.3 || ^2.0",