instantpage
List changes in Releases or in markdown file.
There's no way of knowing what changed between versions unless you go hunting for the changelog on https://instant.page.
I would personally choose to list changes in Releases.
I don’t think that’s worth the effort. https://instant.page is supposed to be the main source of information.
The repository should be free standing and developers shouldn't be driven to a website to see key information like the changelog. When the site inevitably shuts down, that information may as well be lost to any developer searching for it. You are forgoing standard practice because you don't think it's worth the (very minute amount of) effort. Please take some time to reconsider.
I now plan to move documentation from https://github.com/instantpage/instant.page-site into this repo, in the form of bare HTML files.