Merge pull request #2823 from github/robertbrignull/model-editor-changelog

Add changelog entry for model editor

extensions/ql-vscode/CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## [UNRELEASED]
 
+- Release the [CodeQL model editor](https://codeql.github.com/docs/codeql/codeql-for-visual-studio-code/using-the-codeql-model-editor) to create CodeQL model packs for Java frameworks. Open the editor using the "CodeQL: Open CodeQL Model Editor (Beta)" command. [#2823](https://github.com/github/vscode-codeql/pull/2823)
+
 ## 1.8.12 - 11 September 2023
 
 - Fix a bug where variant analysis queries would fail for queries in the `codeql/java-queries` query pack. [#2786](https://github.com/github/vscode-codeql/pull/2786)