Add Symfony 6 support (#57)

Author: bocharsky-bw

composer.json

@@ -11,11 +11,11 @@
     "require": {
         "php": "^7.2 || ^8.0",
         "php-translation/common": "^3.0",
-        "symfony/translation": "^3.4 || ^4.2 || ^5.0"
+        "symfony/translation": "^3.4 || ^4.2 || ^5.0 || ^6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.4",
-        "symfony/framework-bundle": " ^3.4 || ^4.2 || ^5.0"
+        "symfony/framework-bundle": " ^3.4 || ^4.2 || ^5.0 || ^6.0"
     },
     "autoload": {
         "psr-4": {