Update composer.json

ivopetkov · ivopetkov · commit a80b438e910d · 2021-01-02T23:53:17.000+02:00
diff --git a/composer.json b/composer.json
@@ -19,7 +19,7 @@
         "ivopetkov/html5-dom-document-php": "2.*"
     },
     "require-dev": {
-        "phpunit/phpunit": "6.*",
+        "phpunit/phpunit": "6.*|7.*|8.*|9.*",
         "ivopetkov/docs-generator": "0.1.*"
     },
     "autoload": {
