Update composer.json

Co-authored-by: Yozhef <[email protected]>

Author: JeroenVanOort

composer.json

@@ -5,7 +5,7 @@
     "keywords": ["enum", "phpstan"],
     "license": "MIT",
     "require": {
-        "php": "~7.1|8.0",
+        "php": "~7.1|^8.0",
         "myclabs/php-enum": "^1.2",
         "phpstan/phpstan": "^0.10|^0.11|^0.12"
     },