Bitcoin ABC version 0.21.3 is now available from:

  <https://download.bitcoinabc.org/0.21.3/>

This release includes the following features and fixes:
 - Fixed a bug where the `listtransactions` RPC was unable to list transactions
   by a giving label.  This functionality has been restored.
 - MacOS versions earlier than 10.12 are no longer supported.
   Additionally, Bitcoin ABC does not yet change appearance when macOS
   "dark mode" is activated.

New RPC methods
------------
 - `listwalletdir` returns a list of wallets in the wallet directory which is
   configured with `-walletdir` parameter.

Low-level RPC changes
----------------------
 - `-usehd` was removed in version 0.16. From that version onwards, all new
 wallets created are hierarchical deterministic wallets. Version 0.18 makes
 specifying `-usehd` invalid config.

Thread names in logs
--------------------

Log lines can be prefixed with the name of the thread that caused the log.
To enable this behavior, use`-logthreadnames=1`.

Bitcoin ABC version 0.21.3 is now available from:

  <https://download.bitcoinabc.org/0.21.3/>

This release includes the following features and fixes:
 - Fixed a bug where the `listtransactions` RPC was unable to list transactions
   by a giving label.  This functionality has been restored.
 - MacOS versions earlier than 10.12 are no longer supported.
   Additionally, Bitcoin ABC does not yet change appearance when macOS
   "dark mode" is activated.

New RPC methods
------------
 - `listwalletdir` returns a list of wallets in the wallet directory which is
   configured with `-walletdir` parameter.

Low-level RPC changes
----------------------
 - `-usehd` was removed in version 0.19.7. From that version onwards, all new
   wallets created are hierarchical deterministic wallets. Version 0.21.3 makes
   specifying `-usehd` invalid config.

Thread names in logs
--------------------

Log lines can be prefixed with the name of the thread that caused the log.
To enable this behavior, use`-logthreadnames=1`.

Fix usehd release number errors in release notes
Fix usehd release number errors in release notes

Summary: The release numbers for the `-usehd` notes are incorrect.

Test Plan:
  grep -rnI usehd doc/release-notes/
Verify when the option was removed.

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5579
