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NEW FEATURES:
* Add support for Python 3.11. (32)
* Add ``--labels`` flag to ``listprs`` to show pull request labels. (29)
OTHER THINGS:
* Rewrote command line interface using `click
<https://pypi.org/project/click/>`__ and `rich
<https://pypi.org/project/rich/>`__. Output is a lot nicer. Instructions for
handling conflicts when combining PRs are clearer. (36)
* Add command-line help to README. (35)