Capture edit history

[MikeBishop]

The tool currently captures the state of comments when it runs, but doesn't see previous states of edited comments. It might be worth adding edit history to ensure the archive file doesn't lose information if someone wants us to forget what they said. (This would be a file version rev.)

[MikeBishop]

At a first pass, this is fairly simple -- you can capture the edit history of anything of type Comment (issues, issue comments, PR comments, etc.) fairly easily. What still needs to be checked is whether editing a comment causes the parent issue to appear updated; if not, there may be a trade-off between not revisiting old nodes and ensuring we've captured any changes.

Testing now. 😉

[MikeBishop]

It appears that the entire thread does show as updated when any comment in the chain is edited; great!