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]
 o http: added options for allowing HTTP/0.9 responses [10]

This release includes the following bugfixes:

 o OS400: handle memory error in list conversion [4]
 o cookies: extend domain checks to non psl builds [12]
 o curl -J: refuse to append to the destination file [14]
 o darwinssl: accept setting max-tls with default min-tls [6]
 o docs: fix the --tls-max description [2]
 o gopher: always include the entire gopher-path in request [5]
 o http2: clear pause stream id if it gets closed [8]
 o if2ip: remove unused function Curl_if_is_interface_name [9]
 o mbedtls: use VERIFYHOST [15]
 o pingpong: change default response timeout to 120 seconds
 o pingpong: ignore regular timeout in disconnect phase [16]
 o smb: fix incorrect path in request if connection reused [13]
 o urlapi: Fix port parsing of eol colon [1]
 o urlapi: distinguish possibly empty query [5]
 o wolfssl: fix memory-leak in threaded use [11]

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,
  David Garske, Eric Rosenquist, Florian Pritz, jasal82 on github, Kamil Dudka,
  Leonardo Taccari, Matus Uzak, Tobias Lindgren,
  (12 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
 [8] = https://curl.haxx.se/bug/?i=3392
 [9] = https://curl.haxx.se/bug/?i=3401
 [10] = https://curl.haxx.se/bug/?i=2873
 [11] = https://curl.haxx.se/bug/?i=3395
 [12] = https://curl.haxx.se/bug/?i=2964
 [13] = https://curl.haxx.se/bug/?i=3388
 [14] = https://curl.haxx.se/bug/?i=3380
 [15] = https://curl.haxx.se/bug/?i=3376
 [16] = https://curl.haxx.se/bug/?i=3264
