Support for re-running scripts on only failed repos

**Describe the solution you'd like**
I was using `git-xargs` for a set of small changes on a number of repositories, but discovered a few of them have different behavior than anticipated, and I wanted to re-run a modified script against only those failed runs. Is that possible?

**Describe alternatives you've considered**
Manually editing a `repos.txt` file with the repos and re-running seems to be the answer, but it's clunky (imo).

**Additional context**