Symfony 4 support (public: true)

Merge pull request #19 from alessandrocraeye/symfony-4-fixes

Symfony 4 fixes

Fix treebuilder

4.0.1

Merge pull request #17 from carakas/patch-3

PHP 7.4 & 8 support

Merge pull request #16 from jacob-v-dam/upgrade-to-php-80

Upgrade to php 8.0

Support Symfony http-kernel & framework-bundle 4.*

3.0.5

Bump symfony requirements to 4.*

More fixes for $listId not null

Merge pull request #15 from justcarakas/master

More fixes for listId null

$listId may be null

Merge pull request #14 from carakas/patch-1

Fix wrong return type

Fix error when the mail engine is not set

Pull requests:

• #13

Requires PHP 7.1 (Has type hinting and return types)

Merge pull request #12 from mailmotor/php-7-1

Requiring PHP 7.1 with type hinting and return types

Added PHP7

Merge pull request #9 from yukoff/symfony3

Add support for Symfony 3.x

Fix in NotImplementedSubscriberGateway

2.0.1

Comment updated