Xlsxwriter

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* Added :func:`set_top_left_cell` worksheet method to position the first
visible cell in a worksheet.

:feature:`837`.

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* Add python_requires version to setup.py to help pip find the correct
matching version for Python 2 and 3.

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* This is the first Python 3 only version of XlsxWriter. It is approximately
10-15% faster than the Python2/3 version.

Python 2 users should use XlsxWriter version 2.0.0, see below.

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* This is the last XlsxWriter release to support Python 2. From now bug fixes
and new features will only be available for Python 3. The deprecation notice
for Python 2 support in XlsxWriter has been in place since May 2020 and the
Python community support for Python 2 ended in January 2020. Downloads of
XlsxWriter for Python 2 is currently less than 6% of all downloads of the
library, and decreasing month by month.

Python 2 users should still be able to install versions of XlsxWriter up to
this release but not any releases afterwards.

:feature:`720`.

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* Added Description/Alt Text and Decorative accessibility options for charts,
textboxes and buttons. These options were already available for images.

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* Added some performance improvements. Performance for larger files should be
5-10% better.