Generate changelogs/releases automatically

[silasabbott]

I'd suggest adding changesets or something similar to this repo to automatically generate changelogs at each tag/release. Might be something for the backlog at this point in time, but I think this would bring more clarity and organization to the repo.

[dessalines]

What we've been doing for lemmy releases, is just showing the comparison diff, IE : 0.18.0-rc.1...0.19.0-rc.4

Having incremental changelogs probably wouldn't be as useful to app devs as seeing the side-by-side diffs like that.