openpyxl/worksheet/worksheet.py:377:
UserWarning: Call to deprecated function or class get_highest_column
(Use the max_column propery.).
openpyxl/worksheet/worksheet.py:350:
UserWarning: Call to deprecated function or class get_highest_row
(Use the max_row property).
Looks like they've been depreciated for awhile, but I'm only just now seeing the warnings: https://bitbucket.org/openpyxl/openpyxl/annotate/59d472f008dbbe2f99c487879709204115090e93/openpyxl/worksheet/worksheet.py?at=default&fileviewer=file-view-default#worksheet.py-349