Bump pytest from 3.8.2 to 3.9.1

[dependabot-preview]

Bumps pytest from 3.8.2 to 3.9.1.

Changelog

Sourced from pytest's changelog.

pytest 3.9.1 (2018-10-16)

Features

• #4159 <https://github-redirect.dependabot.com/pytest-dev/pytest/issues/4159>_: For test-suites containing test classes, the information about the subclassed
  module is now output only if a higher verbosity level is specified (at least
  "-vv").

pytest 3.9.0 (2018-10-15 - not published due to a release automation bug)

Deprecations

• #3616 <https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3616>_: The following accesses have been documented as deprecated for years, but are now actually emitting deprecation warnings.

  • Access of Module, Function, Class, Instance, File and Item through Node instances. Now
    users will this warning::

      usage of Function.Module is deprecated, please use pytest.Module instead
    

    Users should just import pytest and access those objects using the pytest module.

  • request.cached_setup, this was the precursor of the setup/teardown mechanism available to fixtures. You can
    consult funcarg comparison section in the docs <https://docs.pytest.org/en/latest/funcarg_compare.html>_.

  • Using objects named "Class" as a way to customize the type of nodes that are collected in Collector
    subclasses has been deprecated. Users instead should use pytest_collect_make_item to customize node types during
    collection.

    This issue should affect only advanced plugins who create new collection types, so if you see this warning
    message please contact the authors so they can change the code.

  • The warning that produces the message below has changed to RemovedInPytest4Warning::

      getfuncargvalue is deprecated, use getfixturevalue
    

• #3988 <https://github-redirect.dependabot.com/pytest-dev/pytest/issues/3988>_: Add a Deprecation warning for pytest.ensuretemp as it was deprecated since a while.

Features

• #2293 <https://github-redirect.dependabot.com/pytest-dev/pytest/issues/2293>_: Improve usage errors messages by hiding internal details which can be distracting and noisy.

... (truncated)

Commits

• c5bbf8a make note about the unpublished 3.9.0 release
• 253c578 Preparing release version 3.9.1
• c4550bc Merge branch 'release-3.9.0' of github.com:nicoddemus/pytest into release-3.9.1
• 2c00f8a Merge pull request #4170 from RonnyPfannschmidt/fix-metadata-url-quotes
• 456715a fix url quotes in setup.cfg metadata
• 54b8ad4 Merge pull request #4159 from thisch/subclassedfile
• 2868c31 Preparing release version 3.9.0
• 39a13d7 Fix tmp_path example in docs
• e4e4fd1 Merge pull request #4158 from nicoddemus/merge-master-into-features
• e8c220b Increase required verbosity level for debug output
• Additional commits viewable in compare view

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