Update bumpversion to 0.6.0

[pyup-bot]

This PR updates bumpversion from 0.5.3 to 0.6.0.

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

Links

• PyPI: https://pypi.org/project/bumpversion
• Changelog: https://pyup.io/changelogs/bumpversion/
• Repo: https://github.com/peritus/bumpversion

[codecov-io]

Codecov Report

Merging #169 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #169   +/-   ##
=======================================
  Coverage   82.67%   82.67%           
=======================================
  Files           1        1           
  Lines         127      127           
=======================================
  Hits          105      105           
  Misses         22       22           

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