* Deprecate Client arg 'dispatch' and use 'transport'
* Remove line in test from coverage
* Document custom transports
* _dispatch > _transports
Also rename *Dispatch classes to *Transport and added aliases
* Fix linting issues
* Missed one _transports import
* Promote URLLib3Transport to public API
* Remove duplicate arg doc
* Assert that urllib3 is imported to use URLLib3Transport
* `AsyncClient`, not asynchronous `Client`
* Add warning category to warn calls
* Update docs/advanced.md
Co-authored-by: Florimond Manca <florimond.manca@gmail.com>
* Add warn_deprecated utility function
* Amend docs references to dispatch
* Add concrete implementation example
* Clearer transport implementation description
Co-authored-by: Florimond Manca <florimond.manca@gmail.com>
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