Log Message:
py-xlsxwriter: updated to 1.2.8

Release 1.2.8:

* Fix for issue where duplicate images with hyperlinks weren't handled
  correctly.

* Removed ``ReservedWorksheetName`` exception which was used with the reserved
  worksheet name "History" since this name is allowed in some Excel \ 
variants.

* Fix for worksheet objects (charts, images and textboxes) that are inserted
  with an offset that starts in a hidden cell.

* Fix to allow handling of NoneType in :func:`add_write_handler`.