Log Message:
py-xlsxwriter: updated to 1.1.0

Release 1.1.0:
* Added functionality to align chart category axis labels. See the
  label_align property of the :func:set_x_axis() method.
* Added worksheet :func:hide_row_col_headers() method to turn off worksheet
  row and column headings.
* Added the :func:set_tab_ratio() method to set the ratio between the
  worksheet tabs and the horizontal slider.
* Fixed issue with icon conditional formats when the values were zero.