Update django-filter to 2.2.0

[pyup-bot]

This PR updates django-filter from 2.1.0 to 2.2.0.

Changelog

2.2

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

* Added ``DjangoFilterBackend.get_schema_operation_parameters()`` for DRF 3.10+
OpenAPI schema generation. (1086)
* Added ``lookup_expr`` to ``MultipleChoiceFilter`` (1054)
* Dropped support for EOL Python 3.4

Links

• PyPI: https://pypi.org/project/django-filter
• Changelog: https://pyup.io/changelogs/django-filter/
• Repo: https://github.com/carltongibson/django-filter/tree/master

[codecov]

Codecov Report

Merging #676 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #676   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files          56       56           
  Lines        2859     2859           
=======================================
  Hits         2748     2748           
  Misses        111      111

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[codecov]

Codecov Report

Merging #676 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #676   +/-   ##
=======================================
  Coverage   96.11%   96.11%           
=======================================
  Files          56       56           
  Lines        2859     2859           
=======================================
  Hits         2748     2748           
  Misses        111      111

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8b31e4d...2640fff. Read the comment docs.