~~~~~~~
* **Breaking**: The default dimensions have changed slightly. This is so that
the results of generating a PNG and an SVG look more alike.
* Previous versions included an empty text element for SVGs with no comment.
This is no longer the case.
* Some internals have been improved so as to allow better subclassing.
Subclasses of ``Barcode`` can now override ``default_writer_options`` and
``default_writer()``.
* A ``guardbar`` parameter has been added to EAN barcodes. This renders
barcodes with guardars (longer bars).
* Added support for Python 3.10.
* The documentation setup has been redone, hopefully squashing a lot of legacy
quirks.
* Previous versions installed the `tests` module. This was not intentional and
have been fixed.