update changelog

Author: Stephan Dilly

CHANGELOG.md

@@ -5,11 +5,16 @@ 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
 - 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))
 
+### Fixes
+- panic on small terminal width ([#72](https://github.com/extrawurst/gitui/issues/72))
+
 ## [0.3.0] - 2020-05-20
 
 ### Added