CHANGELOG Next Removed unsupported PHP versions ( 5.x series). Added support for Symfony 4.x . 1.1.0 (2015-04-16) #15: Use TerminableInterface 1.0.1 (2014-02-12) Backport to PHP 5.3 (@henrikbjorn). 1.0.0 (2013-11-14) Initial release.