Changelog updates.

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## [0.24] - unreleased
+
+### Fixes
+
+* Activitypub fixes:
+
+  * Match the Activitypub Hashtag object `href` property value against the raw content in order to make
+    this process platform agnostic.
+
+  * The Activitypub `url` property can now handle nested Link objects for all defined object types.
+
+  * Catch cases where an Activitypub CollectionPage `next` property points back to a Collection object.
+
+  * Add a validation function for the Activitypub `attributedTo` property. Ensure it starts with `http`.
+
+  * Optimize handle_send by ensuring a payload is only sent once per recipient unique endpoint.
+
+  * Make the Activitypub Follow class handle both the Undo and the Accept activities.
+
 ## [0.23.1] - 2023-02-08
 
 ### Changed