Update pytest-mock to 1.5.0

[pyup-bot]

There's a new version of pytest-mock available.
You are currently using 1.4.0. I have updated it to 1.5.0

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

Changelog

1.5.0

---

• New mocker.mock_module variable points to the underlying mock module being used
  (unittest.mock or mock).
  Thanks blueyed_ for the request (71_).

.. _71: pytest-dev/pytest-mock#71

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 91.667% when pulling f9e94fd on pyup-update-pytest-mock-1.4.0-to-1.5.0 into 8f1b8c9 on develop.