Update chardet to 4.0.0

[pyup-bot]

This PR updates chardet from 3.0.4 to 4.0.0.

Changelog

4.0.0

Benchmarking chardet 4.0.0 on CPython 3.7.5 (default, Sep  8 2020, 12:19:42)
[Clang 11.0.3 (clang-1103.0.32.62)]
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Calls per second for each encoding:

Links

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

[codecov-io]

Codecov Report

Merging #51 (700d6ff) into master (203f8eb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   82.05%   82.05%           
=======================================
  Files           2        2           
  Lines          39       39           
=======================================
  Hits           32       32           
  Misses          7        7           

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