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Refactor ``setup.py`` script, improving Python 3 support:
- Counteract a possible ``UnicodeDecodeError`` when ``setup.py`` loads
``README.rst`` to populate the ``long_description`` field.
- Could have fixed this with a two line diff, but noticed some other things I
wanted to improve, so here we are 🙂.
.. _Release 0.24.3: https://github.com/paylogic/py2deb/compare/0.24.2...0.24.3