Allow phpunit 7

Author: AydinHassan

composer.json

@@ -15,7 +15,7 @@
         "kevinlebrun/colors.php": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.0 | ^9.0",
+        "phpunit/phpunit": "^7.0 | ^8.0 | ^9.0",
         "squizlabs/php_codesniffer": "^3.0",
         "phpstan/phpstan": "^0.12.50"
     },