Pending RELEASE-NOTES for the upcoming release

This is work in progress and will change before the release goes public on 3rd of February 2021.

Changes:

• curl: add --create-file-mode [mode]
• curl: add new variables to --write-out
• dns: extend CURLOPT_RESOLVE syntax for adding non-permanent entries
• gopher: implement secure gopher protocol
• http: add Hyper as new optional HTTP backend
• http: introduce AWS HTTP v4 Signature support

Bugfixes:

• badsymbols.pl: add verbose mode -v
• badsymbols.pl: ignore stand-alone single hash lines
• BUG-BOUNTY: minor language updates
• cleanup: fix empty expression statement has no effect
• cmake: Add an option to disable libidn2
• cmake: enable gophers correctly in curl-config
• cmake: expose CURL_DISABLE_OPENSSL_AUTO_LOAD_CONFIG
• cmdline-opts/gen.pl: return hard on errors
• cmdline-opts/retry.d: mention response code 429 as well
• configure: set -Wextra-semi-stmt for clang with --enable-debug
• connect: defer port selection until connect() time
• connect: mark intentional ignores of setsockopt return values
• connect: on linux, enable reporting of all ICMP errors on UDP sockets
• connect: zero variable on stack to silence valgrind complaint
• cookie: avoid the C1001 internal compiler error with MSVC 14
• curl.1: fix typo microsft -> microsoft
• curl: fix handling of -q option
• curl_easy_pause.3: add multiplexed pause effects
• CURLINFO_PRETRANSFER_TIME.3: clarify
• CURLOPT_URL.3: remove scheme specific details
• digest_sspi: Show InitializeSecurityContext errors in verbose mode
• docs/examples: adjust prototypes for CURLOPT_READFUNCTION
• docs/URL-SYNTAX: the URL syntax curl accepts and works with
• docs: enable syntax highlighting in several docs files
• docs: fix line length bug in gen.pl
• docs: fix wrong documentation in help.d
• docs: remove redundant "better" in --fail help
• examples/libtest: add .checksrc to dist
• examples: remove superfluous asterisk uses
• failf: remove newline from formatting strings
• file: don't provide content-length for directories
• getinfo: build with disabled HTTP support
• gitattributes: Set batch files to CRLF line endings on checkout
• h2: do not wait for RECV on paused transfers
• HISTORY: added dates to early history
• http: have CURLOPT_FAILONERROR fail after all headers
• http: show the request as headers even when split-sending
• http_proxy: Fix CONNECT chunked encoding race condition
• httpauth: make multi-request auth work with custom port
• INSTALL: update the list known OSes and CPU archs curl has run on
• lib/unit tests: add missing curl_global_cleanup() calls
• lib1564/5: verify that curl_multi_wakeup returns OK
• lib: remove Curl_ prefix from many static functions
• libssh2: fix "Value stored to 'readdir_len' is never read"
• mime: make sure setting MIMEPOST to NULL resets properly
• misc: assorted typo fixes
• misc: fix "warning: empty expression statement has no effect"
• misc: fix typos
• mk-ca-bundle.pl: deterministic output when using -t
• mqtt: deal with 0 byte reads correctly
• mqtt: handle POST/PUBLISH without a set POSTFIELDSIZE
• multi: set the PRETRANSFER time-stamp when we switch to PERFORM
• multi: skip DONE state if there's no connection left for ftp wildcard
• multi: when erroring in TOOFAST state, act as for PERFORM
• multi_runsingle: bail out early on data->conn == NULL
• ngtcp2: make it build it current master again
• nss: get the run-time version instead of build-time
• OS400: update ccsidcurl.c
• pretransfer: setup the User-Agent header here
• quiche: remove fprintf() leftover
• Revert "CI/github: work-around for brew breakage on macOS"
• runtests: add 'wakeup' as a feature
• runtests: add support for %if [feature] conditions
• schannel: plug a memory-leak
• schannel_verify: fix safefree call typo
• speedcheck: exclude paused transfers
• test1522: add debug tracing
• test1633: set appropriate name
• test179: use consistent header line endings
• tests/mqttd: extract the client id from the correct offset
• tests: make --libcurl tests only test FTP options if ftp enabled
• tool_doswin: Restore original console settings on CTRL signal
• tool_operate: fix the suppression logic of some error messages
• tool_operate: spellfix a comment
• tooĺ_writeout: fix the -w time output units
• travis: limit the tests with quiche builds to HTTPS and FTPS only
• travis: restrict the openssl3 job to only run https and ftps tests
• url: if IDNA conversion fails, fallback to Transitional
• wolfssl: add SECURE_RENEGOTIATION support
• wolfssl: Support wolfSSL builds missing TLS 1.1

Contributors:

0xflotus on github, Andrey Gursky, Bubu on github, Cherish98 on github, Christoph M. Becker, Cory Benfield, Cristian Rodríguez, Dan Fandrich, Daniel Stenberg, Denis Laxalde, Dennis Clarke, Douglas R. Reno, Earnestly on github, Emil Engler, Fabian Keil, Flameborn on github, Ganesh Kamath, Gergely Nagy, Gisle Vanem, Hans-Christian Noren Egtvedt, Harry Sintonen, Himanshu Gupta, Hongyi Zhao, Ian Spence, Jeremy Thibault, Jon Rumsey, Jon Wilkes, Julian Montes, Kevin Ushey, Matthias Gatto, Mike Gelfand, Mike Tzou, Nick Zitzmann, Olaf Hering, parazyd on github, Paul Groke, Ray Satiro, Razvan Cojocaru, Rich Turner, Sean McArthur, Tomas Berger, UrsusArctos on github, William A Rowe Jr, XhmikosR on github, 不确定