curl and libcurl 7.66.0

 Public curl releases:         185
 Command line options:         221
 curl_easy_setopt() options:   268
 Public functions in libcurl:  80
 Contributors:                 1991

This release includes the following changes:

 o curl: support parallel transfers with -Z [4]

This release includes the following bugfixes:

 o HTTP3: initial (experimental still not working) support [5]
 o curl_version_info: provide nghttp2 details [2]
 o docs/MANUAL.md: converted to markdown from plain text [3]
 o multi: call detach_connection before Curl_disconnect [6]
 o source: remove names from source comments [1]
 o ssh-libssh: do not specify O_APPEND when not in append mode [7]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.haxx.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Alessandro Ghedini, Daniel Gustafsson, Daniel Stenberg, Felix Hädicke,
  Gergely Nagy, Marcel Raad, Ray Satiro,
  (7 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://curl.haxx.se/bug/?i=4129
 [2] = https://curl.haxx.se/bug/?i=4121
 [3] = https://curl.haxx.se/bug/?i=4131
 [4] = https://curl.haxx.se/bug/?i=3804
 [5] = https://curl.haxx.se/bug/?i=3500
 [6] = https://curl.haxx.se/bug/?i=4144
 [7] = https://curl.haxx.se/bug/?i=4147