Document the favorites timeline order change

CHANGELOG.md

@@ -91,6 +91,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - MRF: `Delete` activities being exempt from MRF policies
 - OTP releases: Not being able to configure OAuth expired token cleanup interval
 - OTP releases: Not being able to configure HTML sanitization policy
+- Favorites timeline now ordered by favorite date instead of post date
 <details>
   <summary>API Changes</summary>