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>

Author: dependabot-preview[bot]

requirements/wheel.txt

@@ -1,4 +1,4 @@
-pytest==5.3.0
+pytest==5.3.1
 multidict==4.6.1
 mypy-extensions==0.4.3; implementation_name=="cpython"
 idna==2.8