Update dependency cchardet to v2.1.5

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
cchardet	patch	==2.1.1 -> ==2.1.5

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Release Notes

PyYoshi/cChardet

### [`v2.1.5`](https://togithub.com/PyYoshi/cChardet/blob/master/CHANGES.rst#​215) [Compare Source](https://togithub.com/PyYoshi/cChardet/compare/2.1.4...2.1.5) - update language models (uchardet) - add iso8859-2 test but disabled it - support Python 3.8 - drop support for Python 3.4 ### [`v2.1.4`](https://togithub.com/PyYoshi/cChardet/blob/master/CHANGES.rst#​214-2018-09-27) [Compare Source](https://togithub.com/PyYoshi/cChardet/compare/2.1.3...2.1.4) - disable LTO because become poor performance ### [`v2.1.3`](https://togithub.com/PyYoshi/cChardet/blob/master/CHANGES.rst#​213-2018-09-26) [Compare Source](https://togithub.com/PyYoshi/cChardet/compare/2.1.1...2.1.3) - support Python 3.7

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