Bump xlsxwriter from 1.3.7 to 1.3.8

[dependabot[bot]]

Bumps xlsxwriter from 1.3.7 to 1.3.8.

Changelog

Sourced from xlsxwriter's changelog.

Release 1.3.8 - March 29 2021

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

  Feature request [#768](https://github.com/jmcnamara/XlsxWriter/issues/768) <https://github.com/jmcnamara/XlsxWriter/issues/768>_.

• 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.

  Issue [#731](https://github.com/jmcnamara/XlsxWriter/issues/731) <https://github.com/jmcnamara/XlsxWriter/issues/731>_.

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

  Feature request [#784](https://github.com/jmcnamara/XlsxWriter/issues/784) <https://github.com/jmcnamara/XlsxWriter/issues/784>_.

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

  Issue [#764](https://github.com/jmcnamara/XlsxWriter/issues/764) <https://github.com/jmcnamara/XlsxWriter/issues/764>_.

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

  Issue [#790](https://github.com/jmcnamara/XlsxWriter/issues/790) <https://github.com/jmcnamara/XlsxWriter/issues/790>_.

• 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.

  Feature request [#773](https://github.com/jmcnamara/XlsxWriter/issues/773) <https://github.com/jmcnamara/XlsxWriter/issues/773>_.

Commits

• c29e2d3 Prep for release 1.3.8
• 026cda7 Add docs for new insert_image() fields.
• d821d85 Add support to mark images as decorative.
• f166306 Add option to add alt text/descriptions to images.
• 430c005 Minor typo fix.
• 8bdbafc Add fix for timedelta that exceed the Excel 1900 leap day.
• 69d8bbb Add option to set read-only mode when opening a file.
• 9b718c8 Fix issue closing filehandles in constant_memory mode.
• 7956c5b Fix for format with pattern only.
• 59b6d90 Added 'min' crossing option to chart axes.
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 92.292% when pulling 3b6999c712944f80f0184fdf0a10686e9c47e5db on dependabot/pip/xlsxwriter-1.3.8 into 6829037c35b3ce9ff14833bbfeb635b9783abeda on dev.