Log Message:
py-xlsxwriter: updated to 1.3.8

Release 1.3.8 - March 29 2021
-----------------------------

* Added accessibility options "description" and "decorative" to
  :func:`insert_image`.

* Added fix for datetime.timedelta values that exceed the Excel 1900 leap day
  (timedeltas greater than 59 days, in hours). This is a backward incompatible
  change.

* Added the worksheet :func:`read_only_recommended` method to set the Excel
  "Read-only Recommended" option that is available when saving a file.

* Fixed issue where temp files used in `constant_memory` mode weren't
  closed/deleted if the workbook object was garbage collected.

* Fixed issue where pattern formats without colors where given a default black
  fill color.

* Added option to set a chart crossing to 'min' as well as the existing 'max'
  option. The 'min' option isn't available in the Excel interface but can be
  enabled via VBA.