Update changelog

Signed-off-by: Kalina Georgieva <kalina.georgieva@interop.io>

Author: ksgeorgieva

CHANGELOG.md

@@ -22,6 +22,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
+* Fixed `addEventListener` callback receiving the raw `channelChangedEvent` wire message instead of a properly structured `FDC3ChannelChangedEvent` when a user leaves a channel or when the `currentChannelId` field is used in place of the deprecated `newChannelId` field. ([#1870](https://github.com/finos/FDC3/pull/1870))
+
 ## [npm v2.2.2] - 2026-04-13
 
 ### Added