Add domain mutes to changelog

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Private mode support
 - Support for 'Move' type notifications
 - Pleroma AMOLED dark theme
+- User level domain mutes, under User Settings -> Mutes
 ### Changed
 - Captcha now resets on failed registrations
 - Notifications column now cleans itself up to optimize performance when tab is left open for a long time