Fix Twig dependency

composer.json

@@ -55,7 +55,7 @@
         "nexmo/client": "^1.5",
         "pragmarx/google2fa": "^5.0",
         "predis/predis": "^1.1",
-        "twig/twig": "^3.0"
+        "twig/twig": "^2.13"
     },
     "require-dev": {
         "ext-sqlite3": "*",
@@ -113,7 +113,10 @@
         },
         "preferred-install": "dist",
         "sort-packages": true,
-        "optimize-autoloader": true
+        "optimize-autoloader": true,
+        "allow-plugins": {
+            "kylekatarnls/update-helper": true
+        }
     },
     "extra": {
         "branch-alias": {