Update pytest to 5.2.1

[pyup-bot]

This PR updates pytest from 5.2.0 to 5.2.1.

Changelog

5.2.1

=========================

Bug Fixes
---------

- `5902 <https://github.com/pytest-dev/pytest/issues/5902>`_: Fix warnings about deprecated ``cmp`` attribute in ``attrs>=19.2``.

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://pyup.io/changelogs/pytest/
• Homepage: https://docs.pytest.org/en/latest/

[codecov]

Codecov Report

Merging #716 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #716   +/-   ##
=======================================
  Coverage   97.08%   97.08%           
=======================================
  Files          54       54           
  Lines        2742     2742           
=======================================
  Hits         2662     2662           
  Misses         80       80

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