update changelog for 12.1.0

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

CHANGELOG.md

@@ -5,18 +5,23 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 Types of changes can be: Added/Changed/Deprecated/Removed/Fixed/Security
 
-## [UNRELEASED]
+## [12.1.0] - 2021-07-06
 ### Added
+- "share to Nextcloud Talk" from other apps
+- location sharing (requires Talk 12 on server)
+- voice messages (requires Talk 12 on server)
 - open files inside app (jpg, .png, .gif, .mp3, .mp4, .mov, .wav, .txt, .md)
     - other data types are opened with external apps if they are able to handle it
 - edit profile information and privacy settings
 - add grid view for calls, make own video movable
+- improve vcard support
 
 ### Changed
 - improve conversation list design and dark/light theming (@AndyScherzinger)
 - introduce new dark/light toolbar/searchbar design (@AndyScherzinger)
 - improve login screen design (@AndyScherzinger)
 - improve content/toolbar alignments (@AndyScherzinger)
+- various design improvements (@AndyScherzinger)
 
 ### Fixed
 - @ in username is allowed for phonebook sync
@@ -28,6 +33,7 @@ Types of changes can be: Added/Changed/Deprecated/Removed/Fixed/Security
 - do not allow selecting files in files browser that are not allowed to be reshared
 - fix to show all file previews
 - don't keep screen enabled in chat view
+- fix logfile flooding (Too much storage was used when the app was offline and a high performance backend is used)
 
 ## [11.1.0] - 2021-03-12
 ### Added