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* getinfo(CURLINFO_FTP_ENTRY_PATH) now handles NULL return from
libcurl, returning None in this case.
* Python 3.9 is now officially supported (patch by Bill Collins).
* Added CURLOPT_DOH_URL (patch by resokou).
* Best effort Python 2 support has been reinstated.
* Added missing fields to curl_version_info struct (patch by Hasan).
* Added CURLINFO_CONDITION_UNMET (patch by Dima Tisnek).
* Exposed MAX_CONCURRENT_STREAMS in CurlMulti (patch by Alexandre Pion).
* Compilation fixed against Python 3.10 alpha (patch by Kamil Dudka).