Update changelog

Author: hjon

CHANGELOG.md

@@ -4,7 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-# [Unreleased](https://github.com/purecloudlabs/genesys-cloud-streaming-client/compare/v19.5.0...HEAD)
+# [Unreleased](https://github.com/purecloudlabs/genesys-cloud-streaming-client/compare/v19.6.0...HEAD)
+
+# [v19.6.0](https://github.com/purecloudlabs/genesys-cloud-streaming-client/compare/v19.6.0...HEAD)
 ### Added
 * [STREAM-949](https://inindca.atlassian.net/browse/STREAM-949) - Catch errors and emit them as a `disconnected` event and include error.
 * [STREAM-1201](https://inindca.atlassian.net/browse/STREAM-1201) - Add ability to track internally-used subscriptions.