Update pytest-mock to 1.7.0

[pyup-bot]

There's a new version of pytest-mock available.
You are currently using 1.6.3. I have updated it to 1.7.0

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

Changelog

1.7.0

---

Incompatible change

• pytest-mock no longer supports Python 2.6 and Python 3.3, following the lead of
  pytest and other projects in the community. Thanks hugovk_ for the PR (96_).

Packaging

• Fix mock requirement in Python 2. Thanks ghisvail_ for the report (101_).

Internal

• Some tests in pytest-mock's suite are skipped if assertion rewriting is disabled (102_).

.. _ghisvail: https://github.com/ghisvail
.. _hugovk: https://github.com/hugovk
.. _96: pytest-dev/pytest-mock#96
.. _101: pytest-dev/pytest-mock#101
.. _102: pytest-dev/pytest-mock#102

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

Happy merging! 🤖

[pyup-bot]

Closing this in favor of #45