Merge pull request #15 from antistatique/php8

Allow PHP 8.0 and PHP 8.1 version

Author: aderaaij

composer.json

@@ -24,7 +24,7 @@
     }
   },
   "require": {
-    "php": "^7.1"
+    "php": "^7.1 || ^8.0"
   },
   "config": {
     "optimize-autoloader": true,