See: http://symfony.com/blog/helping-prepare-for-symfony-4-bundle-support - [ ] Create test suite - [ ] Make bundle Symfony4 compitable - [ ] Create a receipt for Flex - [ ] Mark it as done on the [Symfony4 Bundle Compatibility List](https://docs.google.com/spreadsheets/d/1mFHQPp9uKtQTFjOBShIoPNHYgmkjHHdskdrd2C0BaF8/edit#gid=1730100865)
See: http://symfony.com/blog/helping-prepare-for-symfony-4-bundle-support