Add changelog

Author: sgiehl

CHANGELOG.md

@@ -4,6 +4,16 @@ This is the Developer Changelog for Matomo platform developers. All changes in o
 
 The Product Changelog at **[matomo.org/changelog](https://matomo.org/changelog)** lets you see more details about any Matomo release, such as the list of new guides and FAQs, security fixes, and links to all closed issues. 
 
+## Matomo 5.6.0
+
+### New Features
+
+* New event `PrivacyManager.deleteDataSubjectsForDeletedSites` to enable plugins to be GDPR compliant, when tracking visit unrelated data.
+
+### HTTP Tracking API
+
+* The new Bot Tracking plugin now supports analyzing requests from AI bots. See https://developer.matomo.org/api-reference/tracking-api#tracking-bots for supported tracking parameters.
+
 ## Matomo 5.4.0
 
 ### Authentication changes