Update pytest to 3.9.2

[pyup-bot]

This PR updates pytest from 3.9.1 to 3.9.2.

Changelog

### 3.9.2 ``` ========================= Bug Fixes --------- - `2909 <https://github.com/pytest-dev/pytest/issues/2909>`_: Improve error message when a recursive dependency between fixtures is detected. - `3340 <https://github.com/pytest-dev/pytest/issues/3340>`_: Fix logging messages not shown in hooks ``pytest_sessionstart()`` and ``pytest_sessionfinish()``. - `3533 <https://github.com/pytest-dev/pytest/issues/3533>`_: Fix unescaped XML raw objects in JUnit report for skipped tests - `3691 <https://github.com/pytest-dev/pytest/issues/3691>`_: Python 2: safely format warning message about passing unicode strings to ``warnings.warn``, which may cause surprising ``MemoryError`` exception when monkey patching ``warnings.warn`` itself. - `4026 <https://github.com/pytest-dev/pytest/issues/4026>`_: Improve error message when it is not possible to determine a function's signature. - `4177 <https://github.com/pytest-dev/pytest/issues/4177>`_: Pin ``setuptools>=40.0`` to support ``py_modules`` in ``setup.cfg`` - `4179 <https://github.com/pytest-dev/pytest/issues/4179>`_: Restore the tmpdir behaviour of symlinking the current test run. - `4192 <https://github.com/pytest-dev/pytest/issues/4192>`_: Fix filename reported by ``warnings.warn`` when using ``recwarn`` under python2. ```

Links

- PyPI: https://pypi.org/project/pytest - Changelog: https://pyup.io/changelogs/pytest/ - Homepage: https://docs.pytest.org/en/latest/

[codecov[bot]]

Codecov Report

Merging #40 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
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  Coverage   95.65%   95.65%           
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  Files           1        1           
  Lines          69       69           
  Branches       12       12           
=======================================
  Hits           66       66           
  Misses          2        2           
  Partials        1        1

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