Remove groups from changelog

CHANGELOG.md

@@ -21,7 +21,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Posts: bot badge on statuses from bot accounts.
 - Compatibility: improved browser support for older browsers.
 - Events: allow to repost events in event menu.
-- Groups: Initial support for groups.
 - Profile: Add RSS link to user profiles.
 - Reactions: adds support for reacting to chat messages.
 - Groups: initial support for groups.