docs: Release Announcement for PR jamulussoftware#3479 — Add JSON-RPC access to directories and server lists (without connect/disconnect methods)

Author: pljones

ReleaseAnnouncement.md

@@ -17,6 +17,7 @@ Here's what's new in the next release of Jamulus:
 - updated the Opus library to version 1.5.2, which may enhance audio quality in some situations ([@softins](https://github.com/softins))
 - disabled swap memory usage on Linux servers to help prevent intermittent unresponsiveness ([@dtinth](https://github.com/dtinth))
 - reordered service initialization on Linux to wait for the network interface to be configured before starting the server ([@rdica](https://github.com/rdica))
+- added JSON-RPC notification of server lists from directories, allowing polling a directory for this info ([@ann0see](https://github.com/ann0see))
 - added a Version column to the server list in the Connect dialog, making it easier to see server versions at a glance ([@softins](https://github.com/softins))
 - added "Sort by Channel" option to the mixer view ([@pljones](https://github.com/pljones))
 - applied rate-limiting to Pan change messages to eliminate lag in their effect ([@softins](https://github.com/softins))