Issue #38: Make the package compatible with Symfony 6.

Author: FlorentTorregrosaSmile

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": ">= 7.1.3",
         "friendsofphp/php-cs-fixer": "^3.12",
-        "symfony/yaml": "^3 || ^4 || ^5"
+        "symfony/yaml": "^3 || ^4 || ^5 || ^6"
     },
     "autoload": {
         "psr-4": {