I will stop “officially supporting” the
release-18.09 branch of Home Manager starting May 1, 2019. The reason being that I want to finally switch my laptop over to NixOS 19.03
If you currently use the 18.09 branch then you are encouraged to switch to the
release-19.03 branch as soon as possible. For the most part it should not be necessary to change your configuration but there are a few exceptions as described in the release notes.