Bump pytest from 5.3.0 to 5.3.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.3.0 to 5.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.3.0...5.3.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

test-requirements.txt

@@ -30,7 +30,7 @@ pytest-asyncio==0.10.0
 pytest-cov==2.8.1
 pytest-flake8==1.0.4
 pytest-mock==1.12.1
-pytest==5.3.0
+pytest==5.3.1
 requests==2.22.0          # via coveralls
 six==1.13.0               # via packaging
 urllib3==1.25.7           # via requests