Update pytest to 3.2.4

[pyup-bot]

There's a new version of pytest available.
You are currently using 3.2.3. I have updated it to 3.2.4

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

Changelog

3.2.4

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

Bug Fixes

• Fix the bug where running pytest with "--pyargs" will result in Items with
  empty "parent.nodeid" if run from a different root directory. (2775 <https://github.com/pytest-dev/pytest/issues/2775>_)

• Fix issue with pytest.parametrize if argnames was specified as kwarg.
  (2819 <https://github.com/pytest-dev/pytest/issues/2819>_)

• Strip whitespace from marker names when reading them from INI config. (2856 <https://github.com/pytest-dev/pytest/issues/2856>_)

• Show full context of doctest source in the pytest output, if the lineno of
  failed example in the docstring is < 9. (2882 <https://github.com/pytest-dev/pytest/issues/2882>_)

Improved Documentation

• Introduce a dedicated section about conftest.py. (1505 <https://github.com/pytest-dev/pytest/issues/1505>_)

• Explicitly mention xpass in the documentation of xfail. (1997 <https://github.com/pytest-dev/pytest/issues/1997>_)

• Append example for pytest.param in the example/parametrize document. (2658 <https://github.com/pytest-dev/pytest/issues/2658>_)

• Clarify language of proposal for fixtures parameters (2893 <https://github.com/pytest-dev/pytest/issues/2893>_)

• List python 3.6 in the documented supported versions in the getting started
  document. (2903 <https://github.com/pytest-dev/pytest/issues/2903>_)

• Clarify the documentation of available fixture scopes. (538 <https://github.com/pytest-dev/pytest/issues/538>_)

• Add documentation about the python -m pytest invocation adding the
  current directory to sys.path. (911 <https://github.com/pytest-dev/pytest/issues/911>_)

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 #151