Update dependencies - v3.4.28.7

Restricting packages listed in "symfony/symfony" to "3.4.*"
Loading composer repositories with package information
Updating dependencies (including require-dev)

Prefetching 4 packages 🎶 💨
  - Downloading (100%)

Package operations: 0 installs, 4 updates, 0 removals
  - Updating symfony/monolog-bundle (v3.3.1 => v3.4.0): Loading from cache
  - Updating symfony/swiftmailer-bundle (v3.2.7 => v3.2.8): Loading from cache
  - Updating symfony/test-pack (v1.0.2 => v1.0.6): Loading from cache
  - Updating twig/twig (v2.11.2 => v2.11.3): Loading from cache
Writing lock file
Generating autoload files

Author: Travis CI User