Treepoem

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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>`__.

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* 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>`__.

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

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

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

* Upgrade BWIPP from 2017-06-20 to 2017-07-10. This has a few bug fixes. 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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* Upgrade BWIPP from 2015-11-24 to 2017-06-20. This has a number of bug fixes,
and supports more barcode types. It has also changed the pixel-for-pixel
output of some formats, although they still encode the same information -
notably QR codes, which are tested in ``treepoem``\'s test suite. You can
read its changelog in the `vendored copy in the treepoem repo
<https://github.com/adamchainz/treepoem/blob/main/treepoem/postscriptbarcode/CHANGES>`__.