updated changelog for 1.3.0 release

CHANGELOG.md

@@ -5,6 +5,19 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [1.3.0] - 2022-08-20
+### Added
+- Support for matrix stickers
+
+### Fixed
+- External matrix users unable to DM appservice
+- Joining a non-public channels on pnut makes matrix room public
+- Timestamps on generated events
+
+### Changed
+- Improved display name for pnut users in matrix rooms
+- Access tokens redacted from appservice logs
+
 ## [1.2.0] - 2021-03-20
 ### Added
 - Support of private messaging and private channels