Release 3.0.2
Created by: matthijskooijman
This PR prepares the tree for releasing 3.0.2.
I have also prepared a Github release at https://github.com/projecthamster/hamster/releases/tag/untagged-2bddf81f5958c6731369. Once this PR is merged, publishing that release will create the tag and finalize the release.
See #608 for some more considerations about preparing this release.