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                        Follow progress on similar feature in GitHub's public roadmap
See https://github.com/github/roadmap/issues/107.
Interesting, to be seen if and how they will integrate the "Require branches to be up to date before merging" protection into the native auto-merge feature.
It’s happening: https://github.blog/changelog/2020-12-16-pull-request-auto-merge-public-beta/!
I've created https://github.com/tibdex/auto-update to focus only the branch updating part.
Thanks @tibdex!