Indicate via a comment if a fix has been released

[nikku]

What should we do?

It is often times unclear if a feature is released (or not released yet). Other projects (example: Electron) have extended automation around what is included in a release (and what not).

Given that we already use conventional commits and #closes hints in our commit logs I'm looking towards something similar, i.e. on release:

• note which (linked) issue it fixed on the issue
• note which (linked) pull request it incorporates, on the PR

Why should we do it?

This improves our communication around releases which would otherwise be manual (i.e. a contributor files a PR and for good measure we need to communicate for them when that gets released).