Merge pull request #27 from Codeception/php8

Support PHP 8

Author: Naktibalda

RoboFile.php

@@ -19,13 +19,10 @@
     "minimum-stability": "RC",
 
     "require": {
-        "php": ">=5.6.0 <8.0",
+        "php": ">=5.6.0 <9.0",
         "codeception/codeception": "^4.0",
         "php-webdriver/webdriver": "^1.6.0"
     },
-    "require-dev": {
-        "codeception/util-robohelpers": "dev-master"
-    },
     "suggest": {
         "codeception/phpbuiltinserver": "Start and stop PHP built-in web server for your tests"
     },