doc: Add historical release notes for 0.19.1

Author: laanwj

doc/release-notes/release-notes-0.19.1.md

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+0.19.1 Release Notes
+===============================
+
+Bitcoin Core version 0.19.1 is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-0.19.1/>
+
+This minor release includes various bug fixes and performance
+improvements, as well as updated translations.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/bitcoin/bitcoin/issues>
+
+To receive security and update notifications, please subscribe to:
+
+  <https://bitcoincore.org/en/list/announcements/join/>
+
+How to Upgrade
+==============
+
+If you are running an older version, shut it down. Wait until it has completely
+shut down (which might take a few minutes for older versions), then run the
+installer (on Windows) or just copy over `/Applications/Bitcoin-Qt` (on Mac)
+or `bitcoind`/`bitcoin-qt` (on Linux).
+
+Upgrading directly from a version of Bitcoin Core that has reached its EOL is
+possible, but it might take some time if the datadir needs to be migrated. Old
+wallet versions of Bitcoin Core are generally supported.
+
+Compatibility
+==============
+
+Bitcoin Core is supported and extensively tested on operating systems using
+the Linux kernel, macOS 10.10+, and Windows 7 and newer. It is not recommended
+to use Bitcoin Core on unsupported systems.
+
+Bitcoin Core should also work on most other Unix-like systems but is not
+as frequently tested on them.
+
+From Bitcoin Core 0.17.0 onwards, macOS versions earlier than 10.10 are no
+longer supported, as Bitcoin Core is now built using Qt 5.9.x which requires
+macOS 10.10+. Additionally, Bitcoin Core does not yet change appearance when
+macOS "dark mode" is activated.
+
+In addition to previously supported CPU platforms, this release's pre-compiled
+distribution provides binaries for the RISC-V platform.
+
+0.19.1 change log
+=================
+
+### Wallet
+- #17643 Fix origfee return for bumpfee with feerate arg (instagibbs)
+- #16963 Fix `unique_ptr` usage in boost::signals2 (promag)
+- #17258 Fix issue with conflicted mempool tx in listsinceblock (adamjonas, mchrostowski)
+- #17924 Bug: IsUsedDestination shouldn't use key id as script id for ScriptHash (instagibbs)
+- #17621 IsUsedDestination should count any known single-key address (instagibbs)
+- #17843 Reset reused transactions cache (fjahr)
+
+### RPC and other APIs
+- #17687 cli: Fix fatal leveldb error when specifying -blockfilterindex=basic twice (brakmic)
+- #17728 require second argument only for scantxoutset start action (achow101)
+- #17445 zmq: Fix due to invalid argument and multiple notifiers (promag)
+- #17524 psbt: handle unspendable psbts (achow101)
+- #17156 psbt: check that various indexes and amounts are within bounds (achow101)
+
+### GUI
+- #17427 Fix missing qRegisterMetaType for `size_t` (hebasto)
+- #17695 disable File-\>CreateWallet during startup (fanquake)
+- #17634 Fix comparison function signature (hebasto)
+- #18062 Fix unintialized WalletView::progressDialog (promag)
+
+### Tests and QA
+- #17416 Appveyor improvement - text file for vcpkg package list (sipsorcery)
+- #17488 fix "bitcoind already running" warnings on macOS (fanquake)
+- #17980 add missing #include to fix compiler errors (kallewoof)
+
+### Platform support
+- #17736 Update msvc build for Visual Studio 2019 v16.4 (sipsorcery)
+- #17364 Updates to appveyor config for VS2019 and Qt5.9.8 + msvc project fixes (sipsorcery)
+- #17887 bug-fix macos: give free bytes to `F_PREALLOCATE` (kallewoof)
+
+### Miscellaneous
+- #17897 init: Stop indexes on shutdown after ChainStateFlushed callback (jimpo)
+- #17450 util: Add missing headers to util/fees.cpp (hebasto)
+- #17654 Unbreak build with Boost 1.72.0 (jbeich)
+- #17857 scripts: Fix symbol-check & security-check argument passing (fanquake)
+- #17762 Log to net category for exceptions in ProcessMessages (laanwj)
+- #18100 Update univalue subtree (MarcoFalke)
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+- Aaron Clauson
+- Adam Jonas
+- Andrew Chow
+- Fabian Jahr
+- fanquake
+- Gregory Sanders
+- Harris
+- Hennadii Stepanov
+- Jan Beich
+- Jim Posen
+- João Barbosa
+- Karl-Johan Alm
+- Luke Dashjr
+- MarcoFalke
+- Michael Chrostowski
+- Russell Yanofsky
+- Wladimir J. van der Laan
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).