Update xlsxwriter to 1.1.8

[pyup-bot]

This PR updates xlsxwriter from 1.1.2 to 1.1.8.

Changelog

1.1.8

--------------------------

* Added ability to combine Doughnut and Pie charts.

* Added gauge chart example which is a combination of a Doughnut and a Pie
chart. See :ref:`ex_chart_gauge`.

1.1.7

-----------------------------

* Added docs on :ref:`object_position`.

* Added fix for sizing of cell comment boxes when they cross columns/rows that
have size changes that occur after the comment is written.
Issue `403 <https://github.com/jmcnamara/XlsxWriter/issues/403>`_ and
issue `312 <https://github.com/jmcnamara/XlsxWriter/issues/312>`_.

* Added fix for the sizing of worksheet objects (images, charts, textboxes)
when the underlying cell sizes have changed and the "object_position"
parameter has been set to 1 "Move and size with cells". An additional mode 4
has been added to simulate inserting the object in hidden rows.
Issue `618 <https://github.com/jmcnamara/XlsxWriter/issues/618>`_.

* Added object positioning for charts and textboxes, it was already supported
for images. Note, the parameter is now called ``object_position``. The
previous parameter name ``positioning`` is deprecated but still supported
for images.
Issue `568 <https://github.com/jmcnamara/XlsxWriter/issues/568>`_.

1.1.6

----------------------------

* Fixed issue where images that started in hidden rows/columns weren't placed
correctly in the worksheet.
Issue `613 <https://github.com/jmcnamara/XlsxWriter/issues/613>`_.

* Fixed the mime-type reported by system ``file(1)``. The mime-type reported
by "file --mime-type"/magic was incorrect for XlsxWriter files since it
expected the ``[Content_types]`` to be the first file in the zip container.
Issue `614 <https://github.com/jmcnamara/XlsxWriter/issues/614>`_.

1.1.5

--------------------------------

* This version removes support for end of life Pythons 2.5, 2.6, 3.1, 3.2 and
3.3. For older, unsupported versions of Python use version 1.1.4 of
XlsxWriter.

1.1.4

--------------------------------

* Fix for issues where zipfile.py raises "ZIP does not support timestamps
before 1980" exception.
Issue `535 <https://github.com/jmcnamara/XlsxWriter/issues/535>`_.

1.1.3

-------------------------------

* Fix handling of ``'num_format': '0'`` in duplicate formats.
Issue `584 <https://github.com/jmcnamara/XlsxWriter/issues/584>`_.

Links

• PyPI: https://pypi.org/project/xlsxwriter
• Changelog: https://pyup.io/changelogs/xlsxwriter/
• Repo: https://github.com/jmcnamara/XlsxWriter