append changelog

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 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).
 
+## 0.5.0 - 2020-10-12
+
+#### Added
+
+- include a static CSS resource to the viewer for project specific styling (mainly the text area)
+
 ## [0.4.0] - 2020-08-28
 
 ### Changed