Update composer.json

Author: barryvdh

composer.json

@@ -15,7 +15,7 @@
         "symfony/form": "^3.4|^4|^5",
         "symfony/validator": "^3|^4|^5",
         "symfony/twig-bridge": "^3|^4|^5",
-        "twig/twig": "^2"
+        "twig/twig": "^2|^3"
     },
     "autoload": {
         "psr-4": {