It already worked for the dmd list, so why not for this list?
If someone is interested in the commit history, Github offers RSS out-of-the-box:

https://github.com/dlang/phobos/commits/master.atom https://github.com/dlang/phobos/releases.atom

and a full-blown API: https://developer.github.com/v3/activity/feeds/

If you want to keep the bot, please move it to a separate phobos-commits mailing list. It really kills all non-human discussion.