Update django-grappelli to 2.14.2

[pyup-bot]

This PR updates django-grappelli from 2.14.1 to 2.14.2.

Changelog

2.14.2

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

* Fixed: Django version (3.0) with docs and quickstart.
* Fixed: Dashboard with metaclass.
* Fixed: Missing variable in RelatedObjectLookups.
* Fixed: Sortables with tuples when using StackedInlines.
* Improved: Removed six dependency.
* Improved: Changed bodyclass in order to allow adding more attributes.
* Improved: Adding Python 3.7 /3.8 to CI tests.

Links

• PyPI: https://pypi.org/project/django-grappelli
• Changelog: https://pyup.io/changelogs/django-grappelli/
• Docs: http://django-grappelli.readthedocs.org

[codecov]

Codecov Report

Merging #1667 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1667   +/-   ##
=======================================
  Coverage   76.81%   76.81%           
=======================================
  Files         120      120           
  Lines        4343     4343           
  Branches      494      494           
=======================================
  Hits         3336     3336           
  Misses        844      844           
  Partials      163      163           

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