Bump pytest from 6.2.1 to 6.2.2 (#31)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.1 to 6.2.2.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.2.1...6.2.2)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_test.txt

@@ -3,4 +3,4 @@ coverage==5.3.1
 black==20.8b1
 flake8==3.8.4
 pylint==2.6.0
-pytest==6.2.1
+pytest==6.2.2