Allow Twig 3

Author: nicolas-grekas

composer.json

@@ -60,7 +60,7 @@
         "symfony/property-info": "^3.4|^4.0|^5.0",
         "symfony/web-link": "^4.4|^5.0",
         "phpdocumentor/reflection-docblock": "^3.0|^4.0",
-        "twig/twig": "~1.41|~2.10"
+        "twig/twig": "^1.41|^2.10|^3.0"
     },
     "conflict": {
         "phpdocumentor/reflection-docblock": "<3.0",