Support PHP8

Author: Thomas Jarrand

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": "^7.4",
+        "php": "^7.4|^8.0",
         "twig/twig": "^2.12|^3.0",
         "symfony/routing": "~4.0|~5.0",
         "symfony/config": "~4.0|~5.0",