MAINT: Bump pytest from 5.3.1 to 5.3.2

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.3.1 to 5.3.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.3.1...5.3.2)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

test_requirements.txt

@@ -1,5 +1,5 @@
 cython==0.29.14
-pytest==5.3.1
+pytest==5.3.2
 pytz==2019.3
 pytest-cov==2.8.1
 pickle5; python_version == '3.7'