adding change log

Author: rabble

CHANGELOG.md

@@ -9,6 +9,7 @@ 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]
+- Added support for displaying kind 20 picture notes generated by Olas. 
 
 ### Release Notes
 - Fixed: adding/removing relays not reflected on feed filter. [#119](https://github.com/verse-pbc/issues/issues/119)