Update pytest to 3.2.1

[pyup-bot]

There's a new version of pytest available.
You are currently using 3.2.0. I have updated it to 3.2.1

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

Changelog

3.2.1

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

Bug Fixes

• Fixed small terminal glitch when collecting a single test item. (2579 <https://github.com/pytest-dev/pytest/issues/2579>_)

• Correctly consider / as the file separator to automatically mark plugin
  files for rewrite on Windows. (2591 <https://github.com/pytest- dev/pytest/issues/2591>_)

• Properly escape test names when setting PYTEST_CURRENT_TEST environment
  variable. (2644 <https://github.com/pytest-dev/pytest/issues/2644>_)

• Fix error on Windows and Python 3.6+ when sys.stdout has been replaced
  with a stream-like object which does not implement the full io module
  buffer protocol. In particular this affects pytest-xdist users on the
  aforementioned platform. (2666 <https://github.com/pytest- dev/pytest/issues/2666>_)

Improved Documentation

• Explicitly document which pytest features work with unittest. (2626 <https://github.com/pytest-dev/pytest/issues/2626>_)

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

Happy merging! 🤖

[codecov-io]

Codecov Report

Merging #66 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #66   +/-   ##
=======================================
  Coverage   79.97%   79.97%           
=======================================
  Files           8        8           
  Lines         844      844           
=======================================
  Hits          675      675           
  Misses        169      169

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