Including R changes in the Changelog

Signed-off-by: Elijah Cúchulainn Reid <[email protected]>

Author: Wizzzzzzard

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add the ability to sort columns in data viewer and view column properties ([#1622](https://github.com/sassoftware/vscode-sas-extension/pull/1622))
 - Add code comment collapsing ([#1638](https://github.com/sassoftware/vscode-sas-extension/pull/1638))
 - Add ability to view dataset properties ([#1631](https://github.com/sassoftware/vscode-sas-extension/pull/1631))
+- Add R language support for PROC RLANG (syntax highlighting, notebook cells, code formatting preservation)
 
 ### Fixed