------------------
* Upgrade BWIPP from 2019-04-24 to 2019-08-05.
This version has a few bug fixes and performance improvements.
You can read its changelog in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.
* Converted setuptools metadata to configuration file.
This meant removing the ``__version__`` attribute from the package.
If you want to inspect the installed version, use ``importlib.metadata.version("treepoem")`` (`docs <https://docs.python.org/3.8/library/importlib.metadata.html#distribution-versions>`__ / `backport <https://pypi.org/project/importlib-metadata/>`__).
* Update Python support to 3.5-3.8.