Allow versions below 3.16 due to PHP 7 support

Author: glye

composer.json

@@ -50,7 +50,7 @@
         "friendsofsymfony/http-cache-bundle": "^2.8",
         "sensio/framework-extra-bundle": "^6.1",
         "jms/translation-bundle": "^1.5",
-        "twig/twig": "^3.19.0",
+        "twig/twig": ">=3.0 <3.16 || ^3.19.0",
         "twig/extra-bundle": "^3.0",
         "friendsofsymfony/jsrouting-bundle": "^2.5",
         "friendsofphp/proxy-manager-lts": "^1.0",