Merge pull request #133 from gndk/symfony-6

Allow Symfony 6.0

Author: freekmurze

composer.json

@@ -24,9 +24,9 @@
         "ext-dom": "*",
         "ext-json": "*",
         "phpunit/phpunit": "^8.3|^9.0",
-        "symfony/property-access": "^4.0|^5.0",
-        "symfony/serializer": "^4.0|^5.0",
-        "symfony/yaml": "^4.0|^5.0"
+        "symfony/property-access": "^4.0|^5.0|^6.0",
+        "symfony/serializer": "^4.0|^5.0|^6.0",
+        "symfony/yaml": "^4.0|^5.0|^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.1.0"