Add support for PHP 8 (#51)

* Add support for PHP 8

* Allow ^4.0 of php-translation/common

* Dont allow common 4.0

Co-authored-by: Nyholm <[email protected]>

Author: lepiaf

composer.json

@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "php-translation/common": "^3.0",
         "symfony/translation": "^3.4 || ^4.2 || ^5.0"
     },