support new --update-refs feature

[forivall]

Git added a new rebase feature: update-refs

https://github.blog/2022-10-03-highlights-from-git-2-38/#rebase-dependent-branches-with-update-refs

the line in a todo looks like

update-ref refs/heads/other-branch

I'll look at tackling this one too, in a separate PR.

[MitMaro]

That's a feature that I didn't know I wanted!

Adding support would be great!

I think initially, allowing it to be parsed (similar to how exec is currently parsed) would be enough. Since this would ensure that people using that option can continue to use the tool. I think then it can be followed up with adding support for the "edit" and "insert" lines functionality would be beneficial.

p.s. Thanks for bringing up these rebase changes/options. I haven't been as on top of the new changes to Git over the last while and have missed a lot.