* Add Response(..., default_encoding=...)
* Add tests for Response(..., default_encoding=...)
* Add Client(..., default_encoding=...)
* Switch default encoding to 'utf-8' instead of 'autodetect'
* Make charset_normalizer an optional dependancy, not a mandatory one.
* Documentation
* Use callable for default_encoding
* Update tests for new charset autodetection API
* Update docs for new charset autodetection API
* Update requirements
* Drop charset_normalizer from requirements
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