update changelog

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ## [Unreleased patch]
 
+### Fixed
+- Fixed chats list not updating its order when new messages come in
+- Fixed chat messages sometimes getting lost when you receive a message at the same time 
+
+
+## [2.1.1] - 2020-09-08
 ### Changed
 - Polls will be hidden with status content if "Collapse posts with subjects" is enabled and the post is collapsed.
 
@@ -13,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Autocomplete won't stop at the second @, so it'll still work with "@lain@l" and not start over.
 - Fixed weird autocomplete behavior when you write ":custom_emoji: ?"
 
+
 ## [2.1.0] - 2020-08-28
 ### Added
 - Autocomplete domains from list of known instances