Updated composer.json for Symfony >= 4.0

Update Symfony and PHP versions in CI

Merge pull request #11 from trjili/cb_sf4

[Data Collector] SF4 twig path compatibility

Merge pull request #5 from tibo6/patch-1

Update services.yml

Merge pull request #2 from mailjet/campaign_feature

Campaign feature

Merge pull request #3 from xawiers/deprecated-param-format

Fix Symfony 3 deprecated param usage.

Fix command event bug

doc prepare v1.0.0

fix doc

fix events

prepare 1.0.0-beta.1