Fix installing on PHP 8.1.1 (#59)

Author: Krakozaber

composer.json

@@ -18,7 +18,7 @@
     ],
     "minimum-stability": "RC",
     "require": {
-        "php": ">=5.6.0 <=8.1",
+        "php": ">=5.6.0 <=8.1 | ~8.1.0",
         "codeception/lib-innerbrowser": "^1.0",
         "codeception/codeception": "^4.0"
     },