add changelog entry

CHANGELOG.md

@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Emoji picker
 - Started changelog anew
 - Ability to change user's email
+- About page
 ### Changed
 - changed the way fading effects for user profile/long statuses works, now uses css-mask instead of gradient background hacks which weren't exactly compatible with semi-transparent themes
 ### Fixed