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* Inroduce request and response interceptors.
* Run mitmproxy backend in a thread rather than subprocess.
* Drop internal HTTP admin API.
* Drop support for Python 3.4 and 3.5.
* Add support for remote webdriver client.
* Add support for duplicate request and response headers.
* Fixed issue where Proxy-Connection header was being propagated.
* Fixed issue where desired capabilities could not be reused outside of Selenium Wire due to addition of proxy config.
* Deprecation of header_overrides, param_overrides, querystring_overrides, rewrite_urls, custom_response_handler