Update changelog in preparation for v1.2.2 release (#433)

* Update changelog in preparation for v1.2.2 release

Co-authored-by: Shati Patel <[email protected]>

Author: aeisenberg

extensions/ql-vscode/CHANGELOG.md

@@ -1,8 +1,11 @@
 # CodeQL for Visual Studio Code: Changelog
 
-## 1.2.2
+## 1.2.2 - 8 June 2020
 
 - Fix auto-indentation rules.
+- Add ability to download platform-specific releases of the CodeQL CLI if they are available.
+- Fix handling of downloading prerelease versions of the CodeQL CLI.
+- Add pagination for displaying non-interpreted results.
 
 ## 1.2.1 - 29 May 2020