Require PHP 8.4, allow Symfony 8 + streamline configuration

Make Cascade attribute repeatable

Support Symfony 7

Remove PHP 8.1 tests from travis

Travis does not seem to support PHP 8.1 so far.

Merge pull request #1 from zing-james/fix-trigger-caching

Changed visibility of trigger property

Add PHP8 attributes support

Relax version constraint for PHP

Allow Symfony 5 and switch to composer-bin-plugin

First release