update CHANGELOG

Author: d-biehl

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to the "robotcode" extension will be documented in this file
 
 ## [Unreleased]
 
+### added
+- added section about style customization to README.md
+- added file icons for robot files
+  - in VSCode Version >= 1.64, if the icon theme does not provide an icon for robot files, this icon is used
+- add automatic debug configurations
+  - you don't need to create a launch.json to run tests in the debugger view
+
 ##  0.5.0
 
 ### added