Update cchardet to 2.1.5

[pyup-bot]

This PR updates cchardet from 2.1.4 to 2.1.5.

Changelog

### 2.1.5 ``` ----- - update language models (uchardet) - add iso8859-2 test but disabled it - support Python 3.8 - drop support for Python 3.4 ```

Links

- PyPI: https://pypi.org/project/cchardet - Changelog: https://pyup.io/changelogs/cchardet/ - Repo: https://github.com/PyYoshi/cChardet

[coveralls]

Pull Request Test Coverage Report for Build 1237

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.275%

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Totals
Change from base Build 1198:	0.0%
Covered Lines:	2191
Relevant Lines:	2207

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💛 - Coveralls

[pyup-bot]

Closing this in favor of #329