Update gitchangelog to 3.0.4

[pyup-bot]

This PR updates gitchangelog from 3.0.3 to 3.0.4.

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

Links

• PyPI: https://pypi.org/project/gitchangelog
• Repo: http://github.com/vaab/gitchangelog

[codecov-io]

Codecov Report

Merging #74 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #74   +/-   ##
=======================================
  Coverage   48.25%   48.25%           
=======================================
  Files          10       10           
  Lines         887      887           
  Branches      129      129           
=======================================
  Hits          428      428           
  Misses        411      411           
  Partials       48       48

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