Ah whoops, can't believe I wasted time on this when #949 already exists!

While I'm here I can report that I updated the GitHub API VCR cassettes and tried out using actual pull_request objects for pull requests instead of issues. The merge_commit_sha turns out to be less useful than the comment in generator_fetcher.rb anticipated, as for example with https://github.com/github-changelog-generator/changelog_test/pulls/2 the merge_commit_sha points to a commit that no longer exists and this produces incorrect results in various ways. So using the attached events is superior. Hope that helps.

@cormacrelf If you want to, you can propose a PR, collecting those thoughts into something everyone can read. I'm only the care-taker.

@olleolleolle it would just be a PR updating a comment, but sure.