update to changelog

CHANGELOG.md

@@ -5,6 +5,18 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [1.2.0] - 2021-03-20
+### Added
+- Support of private messaging and private channels
+
+## [1.1.1] - 2021-03-05
+### Fixed
+- Pass correct image size info for image attachments
+
+## [1.1.0] - 2021-02-27
+### Added
+- Support for pnut v1 app streams
+
 ## [1.0.2] - 2019-02-02
 ### Fixed
 - error checking when avatar changes