update changes

Author: Stephan Dilly

CHANGELOG.md

@@ -5,6 +5,7 @@ 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]
+- stashing support ([#3](https://github.com/extrawurst/gitui/issues/3))
 
 ### Changed
 - log tab refreshes when head changes ([#78](https://github.com/extrawurst/gitui/issues/78))