Better PHPUnit version range

Author: phpfui

composer.json

@@ -16,7 +16,7 @@
         "rexxars/html-validator": ">=2.2"
     },
     "require-dev": {
-        "phpunit/phpunit": ">=7.0",
+        "phpunit/phpunit": "^7.0 | <10.0",
         "phpfui/phpunit-syntax-coverage": ">=1.0",
         "roave/security-advisories": "dev-latest",
         "friendsofphp/php-cs-fixer": "^3.2"