Feature request: Update existing comment

Currently each new failure adds a new comment (I think?), it would be nice to have an option for it to update an existing comment. They offer something similar in `pytest-coverage-comment` https://github.com/MishaKav/pytest-coverage-comment/blob/a1fe18e2b00c64a765568e2edb9f1706eb8fc88b/src/index.js#L20 