Treepoem

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* 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.

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* Update Python support to 3.5-3.7, as 3.4 has reached its end of life.

* Upgrade BWIPP from 2017-07-27 to 2019-04-24.
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>`__.

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* Drop Python 2 support, only Python 3.4+ is supported now.

* Upgrade BWIPP from 2017-05-20 to 2018-07-27.
This version has a few bug fixes and performance improvements.
You can read its changelog in the vendored copy in the `treepoem repo <https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.

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* Support binary barcode data - if ``bytes`` (``str`` on Python 2) is passed
as data, it's not encoded. This has introduced a dependency on ``six``. This
may be backwards incompatible, depending on what type of data you're passing
in on Python 2.
* Make ``treepoem.barcode_types`` a ``dict`` mapping the BWIPP encoder
names to a custom type containing a human-readable ``description``. This is
backwards incompatible if you're relying on ``barcode_types`` which
previously was a ``set`` of the encoder names.
* Upgrade BWIPP from 2017-10-19 to 2018-05-20. This has a few bug fixes and
performance improvements. You can read its changelog in the vendored copy in
the `treepoem repo
<https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.

------------------

* Fix formatting bug in CLI output.

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* Make the ``options`` argument to ``generate_barcode`` optional.
* Add a CLI ``treepoem``.
* Upgrade BWIPP from 2017-07-10 to 2017-10-19. This has a few bug fixes and
performance improvements. You can read its changelog in the vendored copy in
the `treepoem repo
<https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.