Update pytest to 4.6.2

[pyup-bot]

This PR updates pytest from 4.6.0 to 4.6.2.

Changelog

4.6.1

=========================

Bug Fixes
---------

- `5354 <https://github.com/pytest-dev/pytest/issues/5354>`_: Fix ``pytest.mark.parametrize`` when the argvalues is an iterator.


- `5358 <https://github.com/pytest-dev/pytest/issues/5358>`_: Fix assertion rewriting of ``all()`` calls to deal with non-generators.

Links

• PyPI: https://pypi.org/project/pytest
• Changelog: https://pyup.io/changelogs/pytest/
• Homepage: https://docs.pytest.org/en/latest/

[pyup-bot]

Closing this in favor of #15