[core-workflow] git notifications

[Ethan Furman]

One thing that seems to be lacking: names of commenters.

In the recent thread about [Provide guidance on editing PRs prior to merge (#129)] there are several entries, from at least two people, and I have no idea who they are or exactly which one said what because their names are not showing up anywhere that I can see.

Granted I could go and look on GitHub directly, but this feels like a regression from our previous work flow.

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~Ethan~