Support "latest-only" changelogs
In order to facilitate posting "this release introduces" type posts, it might be useful to only generate a changelog for the latest release (aka this new release brings in these new things).
We could have a flag on changelog like --latest-only
that does this.
Our use case is for a slack webhook to post changes upon releases.
I'd be willing to have a go implementing this if (a) it's a good idea, and (b) you can point me somewhere to start - i'm not familar with Go, but have enough experience I should be able to muddle my way through.