Update pytest-mock to 1.3.0

[pyup-bot]

There's a new version of pytest-mock available.
You are currently using 1.2. I have updated it to 1.3.0

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.3

---

• Add support for Python 3.6. Thanks hackebrot_ for the report (59_).
• mock.mock_open is now aliased as mocker.mock_open for convenience.
  Thanks pokidovea_ for the PR (66_).

.. _hackebrot: https://github.com/hackebrot
.. _pokidovea: https://github.com/pokidovea
.. _59: pytest-dev/pytest-mock#59
.. _66: pytest-dev/pytest-mock#66

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖

[coveralls]

Coverage remained the same at 85.714% when pulling 8a36f3d on pyup-update-pytest-mock-1.2-to-1.3.0 into 057f9ef on develop.