Update chardet to 5.0.0

[pyup-bot]

This PR updates chardet from 3.0.4 to 5.0.0.

Changelog

5.0.0

⚠️ This release is the first release of chardet that no longer supports Python < 3.6 ⚠️

In addition to that change, it features the following user-facing changes:

- Added a prober for Johab Korean (207, grizlupo)
- Added a prober for UTF-16/32 BE/LE (109, 206, jpz) 
- Added test data for Croatian, Czech, Hungarian, Polish, Slovak, Slovene, Greek, and Turkish, which should help prevent future errors with those languages
- Improved XML tag filtering, which should improve accuracy for XML files (208)
- Tweaked `SingleByteCharSetProber` confidence to match latest uchardet (209)
- Made `detect_all` return child prober confidences (210)
- Updated examples in docs (223, domdfcoding)
- Documentation fixes (212, 224, 225, 226, 220, 221, 244 from too many to mention)
- Minor performance improvements (252, deedy5)
- Add support for Python 3.10 when testing (232, jdufresne)
- Lots of little development cycle improvements, mostly thanks to jdufresne

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