Bump symfony/twig-bundle up to ^2.7.29 that uses Twig namespaces too

Author: bocharsky-bw

composer.json

@@ -14,7 +14,7 @@
         "symfony/framework-bundle": "^2.7 || ^3.0 || ^4.0",
         "symfony/validator": "^2.7 || ^3.0 || ^4.0",
         "symfony/translation": "^2.7 || ^3.0 || ^4.0,<4.2",
-        "symfony/twig-bundle": "^2.7 || ^3.0 || ^4.0",
+        "symfony/twig-bundle": "^2.7.29 || ^3.0 || ^4.0",
         "symfony/finder": "^2.7 || ^3.0 || ^4.0",
         "symfony/intl": "^2.7 || ^3.0 || ^4.0",