Televize

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* Support python 3.6-3.9.
* Restore certificate verification.
* Update README.
* Update settings for tests, static checks and CI.
* Resolve various warnings.

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* Fix after ceskatelevize.cz switched to HTTPS.
* Fix PyPI description by using ReST for readme and changelog.

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* Fix pypi upload

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* Add support for "pořady" URLs.
* Fix live streams after CT update in April.

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* Add `--quality` argument to select stream quality.
* Better exception handling.