Merge pull request #14 from PlumTreeSystems/php8.0

php 8 support solves #13

Author: lordthorzonus

composer.json

@@ -6,7 +6,7 @@
     "require": {
         "react/promise": "^2.7.1",
         "react/event-loop": "^1.1.1",
-        "php": "^7.4.0"
+        "php": "^7.4.0|^8.0"
     },
     "require-dev" : {
         "phpunit/phpunit": "^9.1.4"