Fixed composer.json

Author: Andrey Helldar

composer.json

@@ -16,7 +16,7 @@
     },
     "require-dev": {
         "orchestra/testbench": "^4.0 || ^5.0 || ^6.0 || ^7.0",
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^8.5 || ^9.0"
     },
     "minimum-stability": "stable",
     "autoload": {