Release notes for previous releases

* 4.1 - July 2015

* 4.2 - October 2015

* 4.3 - January 2016

* 4.4 - May 2016

* 4.5 - October 2016

* 4.6 - April 2017

* 4.7 - January 2018

* 4.8 - May 2018

Upcoming release

* 4.9 - November 2018

Please add to the release notes as changes are added: