build: Bump version to 0.20.99

Now that 0.20 branch has been split off, master is 0.20.99 (pre-0.21).

Also clean out release notes.

Tree-SHA512: bba6133ae9708f75206c8934901b9f9909a233330f4dfefb3c24175bf8e11631cdc89a5d24a22421a73083f7eb743e977db8020b87dfbd3c1e6043929a19a285

1 files changed, 70 insertions, 2 deletions

diff --git a/doc/release-notes.md b/doc/release-notes.md
index cd6a4d6b59..db5aa0d8a7 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -1,5 +1,73 @@
-Please edit the release notes here:
+*After branching off for a major version release of Bitcoin Core, use this
+template to create the initial release notes draft.*
 
-https://github.com/bitcoin-core/bitcoin-devwiki/wiki/0.20.0-Release-Notes-Draft
+*The release notes draft is a temporary file that can be added to by anyone. See
+[/doc/developer-notes.md#release-notes](/doc/developer-notes.md#release-notes)
+for the process.*
+
+*Create the draft, named* "*version* Release Notes Draft"
+*(e.g. "0.20.0 Release Notes Draft"), as a collaborative wiki in:*
+
+https://github.com/bitcoin-core/bitcoin-devwiki/wiki/
 
 *Before the final release, move the notes back to this git repository.*
+
+*version* Release Notes Draft
+===============================
+
+Bitcoin Core version *version* is now available from:
+
+  <https://bitcoincore.org/bin/bitcoin-core-*version*/>
+
+This release includes new features, 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.
+
+Notable changes
+===============
+
+Credits
+=======
+
+Thanks to everyone who directly contributed to this release:
+
+
+As well as to everyone that helped with translations on
+[Transifex](https://www.transifex.com/bitcoin/bitcoin/).