Update CHANGELOG.md

Author: danney-chun

CHANGELOG.md

@@ -4,6 +4,7 @@
 ### **Improvement**
 - Added `metadataKey`, `metadataValues`, `metadataValueStartsWith` in `GroupChannelFilter`
  - Metadata-related filters work with `includeMetaData` to be set to `true`
+
 ## v4.18.0 (May 21, 2025)
 ### **Feature**
 A new feature has been added that allows you to mark messages in the channel as `unread` from a specific message.