Update CHANGELOG.md

Author: erikw

CHANGELOG.md

@@ -5,6 +5,9 @@ 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).
 
 ## [Unreleased]
+### Added
+- Dual status bar support [#380](https://github.com/erikw/tmux-powerline/pull/380)
+
 
 ## [3.0.0] - 2023-10-02
 ### Added