Update pytest to 3.0.1

[pyup-bot]

There's a new version of pytest available.
You are currently using 3.0.0. I have updated it to 3.0.1

Changelog

3.0.1

• Fix regression when importorskip is used at module level (1822).
  Thanks jaraco and The-Compiler_ for the report and nicoddemus_ for the PR.
• Fix parametrization scope when session fixtures are used in conjunction
  with normal parameters in the same call (1832).
  Thanks The-Compiler for the report, Kingdread_ and nicoddemus_ for the PR.
• Fix internal error when parametrizing tests or fixtures using an empty ids argument (1849).
  Thanks OPpuolitaival for the report and nicoddemus_ for the PR.
• Fix loader error when running pytest embedded in a zipfile.
  Thanks mbachry_ for the PR.

.. _Kingdread: https://github.com/Kingdread
.. _mbachry: https://github.com/mbachry
.. _OPpuolitaival: https://github.com/OPpuolitaival

.. _1822: pytest-dev/pytest#1822
.. _1832: pytest-dev/pytest#1832
.. _1849: pytest-dev/pytest#1849

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

Happy merging! 🤖