curl and libcurl 7.64.0

 Public curl releases:         179
 Command line options:         219
 curl_easy_setopt() options:   262
 Public functions in libcurl:  80
 Contributors:                 1829

This release includes the following changes:

 o cookies: leave secure cookies alone [3]
 o http: Implement trailing headers for chunked transfers [7]

This release includes the following bugfixes:

 o urlapi: Fix port parsing of eol colon [1]
 o docs: fix the --tls-max description [2]
 o OS400: handle memory error in list conversion [4]
 o urlapi: distinguish possibly empty query [5]
 o gopher: always include the entire gopher-path in request [5]
 o darwinssl: accept setting max-tls with default min-tls [6]

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:

  Andrei Neculau, Ayoub Boudhar, Daniel Gustafsson, Daniel Stenberg,
  Leonardo Taccari, Tobias Lindgren,
  (6 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=3365
 [2] = https://curl.haxx.se/bug/?i=3368
 [3] = https://curl.haxx.se/bug/?i=2956
 [4] = https://curl.haxx.se/bug/?i=3372
 [5] = https://curl.haxx.se/bug/?i=3369
 [6] = https://curl.haxx.se/bug/?i=3367
 [7] = https://curl.haxx.se/bug/?i=3350
