Update pyyaml to 5.2

[pyup-bot]

This PR updates PyYAML from 5.1.2 to 5.2.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/pyyaml
• Repo: https://github.com/yaml/pyyaml

[hydrosquall]

Read through yaml/pyyaml#336 and it seems ok!

[codecov]

Codecov Report

Merging #378 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #378   +/-   ##
=======================================
  Coverage   94.64%   94.64%           
=======================================
  Files           5        5           
  Lines         224      224           
=======================================
  Hits          212      212           
  Misses         12       12

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