update CHANGELOG

Author: d-biehl

CHANGELOG.md

@@ -8,9 +8,8 @@ All notable changes to the "robotcode" extension will be documented in this file
 - extend README.md
   - added section about style customization
   - extend feature description
-
 - added file icons for robot files
-  - starting with VSCode Version 1.64, if the icon theme does not provide an icon for robot files, this icon is used
+  - starting with VSCode Version 1.64, if the icon theme does not provide an icon for robot files, these icons are used
 - add automatic debug configurations
   - you don't need to create a launch.json to run tests in the debugger view
 - correct step-in FINALLY in debugger