-r requirements.txt

flake8==3.7.9
tox==3.14.1
pytest==4.6.7

-r requirements.txt

flake8==3.7.9
tox==3.14.1
pytest==4.6.8

Bump pytest from 4.6.7 to 4.6.8
Bump pytest from 4.6.7 to 4.6.8

Bumps [pytest](https://github.com/pytest-dev/pytest) from 4.6.7 to 4.6.8.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/4.6.8/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/4.6.7...4.6.8)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>