Update ChangeLog

Author: geaz

CHANGELOG.md

@@ -5,15 +5,6 @@ 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
-- Right click command in explorer view to open STL in viewer
-- Set cover image vscode command
-
-### Changed
-- Single image necessary as cover, if uploading to 3D2P website
-
-### Removed
-- Gallery TreeView
 
 ## [0.5.3] - 2020-04-27
 ### Changed