update composer.json for different phpunit version

Author: lihsai0

composer.json

@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "paragonie/random_compat": ">=2",
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "^4.8 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4",
         "squizlabs/php_codesniffer": "~3.6"
     },
     "autoload": {