cURL full changelog

Changes:
curl: add --ssl-revoke-best-effort to allow a "best effort" revocation check
mqtt: add new experimental protocol

Bugfixes:
ares: store dns parameters for duphandle
cirrus-ci: disable the FreeBSD 13 builds

Changes:
Polarssl: removed
Smtp: add CURLOPT_MAIL_RCPT_ALLLOWFAILS and --mail-rcpt-allowfails
WolfSSH: new SSH backend

Changes:
TLS: add BearSSL vtls implementation
XFERINFOFUNCTION: support CURL_PROGRESSFUNC_CONTINUE
curl: add --etag-compare and --etag-save

Changes:
curl: added --no-progress-meter
setopt: CURLMOPT_MAX_CONCURRENT_STREAMS is new
urlapi: CURLU_NO_AUTHORITY allows empty authority/host part
Bugfixes:
BINDINGS: five new bindings addded
CURLOPT_TIMEOUT.3: Clarify transfer timeout time includes queue time
CURLOPT_TIMEOUT.3: remove the mention of "minutes"
ESNI: initial build/setup support
FTP: FTPFILE_NOCWD: avoid redundant CWDs
FTP: allow "rubbish" prepended to the SIZE response
FTP: remove trailing slash from path for LIST/MLSD
FTP: skip CWD to entry dir when target is absolute
FTP: url-decode path before evaluation
HTTP3.md: move -p for mkdir, remove -j for make
HTTP3: fix invalid use of sendto for connected UDP socket
HTTP3: fix ngtcp2 Windows build
HTTP3: fix prefix parameter for ngtcp2 build
HTTP3: fix typo somehere1 > somewhere1
HTTP3: show an --alt-svc using example too
INSTALL: add missing space for configure commands
INSTALL: add vcpkg installation instructions
README: minor grammar fix

Changes:
CURLINFO_RETRY_AFTER: parse the Retry-After header value
HTTP3: initial (experimental still not working) support

Bugfixes:
progress: make the progress meter appear again

CURLOPT_LOW_SPEED_* repaired
NTLM reset proxy "multipass" state when CONNECT request is done
PolarSSL deprecate support step 1. Removed from configure
appveyor add Visual Studio solution build

Changes:
alt-svc: experiemental support added
configure: add --with-amissl
Bugfixes:
AppVeyor: add MinGW-w64 and classic Mingw builds
AppVeyor: switch VS 2015 builds to VS 2017 image
CURLU: fix NULL dereference when used over proxy
Curl_easy: remove req.maxfd - never used!
Curl_now: figure out windows version in win32_init:
Curl_resolv: fix a gcc -Werror=maybe-uninitialized warning
DoH: inherit some SSL options from user's easy handle
Secure Transport: no more "darwinssl"
Secure Transport: tvOS 11 is required for ALPN support
cirrus: Added FreeBSD builds using Cirrus CI
cleanup: make local functions static
cli tool: do not use mime.h private structures
cmdline-opts/proxytunnel.d: the option tunnnels all protocols
configure: add additional libraries to check for LDAP support
configure: remove the unused fdopen macro
configure: show features as well in the final summary

Changes:
Cookies: leave secure cookies alone
Hostip: support wildcard hosts