Bump pytest from 5.4.3 to 6.0.1 (#368)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.3 to 6.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.3...6.0.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -1,6 +1,6 @@
 -r requirements.txt
 coverage
-pytest==5.4.3
+pytest==6.0.1
 pytest-asyncio==0.14.0
 pytest-aiohttp==0.3.0
 pytest-cov==2.10.1