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

Author: bocharsky-bw

composer.json

@@ -31,7 +31,7 @@
         "php-http/message": "^1.6",
         "php-http/message-factory": "^1.0.2",
         "symfony/console": "^2.7 || ^3.0 || ^4.0",
-        "symfony/twig-bridge": "^2.7 || ^3.0 || ^4.0",
+        "symfony/twig-bridge": "^2.7.29 || ^3.0 || ^4.0",
         "symfony/asset": "^2.7 || ^3.0 || ^4.0",
         "symfony/templating": "^2.7 || ^3.0 || ^4.0",
         "symfony/dependency-injection": "^2.7 || ^3.0 || ^4.0",