Update pytest to 3.2.0

[pyup-bot]

There's a new version of pytest available.
You are currently using 3.1.3. I have updated it to 3.2.0

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

I couldn't find a changelog for this release. Do you know where I can find one? Tell me!

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 #2153 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2153   +/-   ##
=======================================
  Coverage   97.09%   97.09%           
=======================================
  Files          39       39           
  Lines        7781     7781           
  Branches     1357     1357           
=======================================
  Hits         7555     7555           
  Misses        101      101           
  Partials      125      125

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