updated changelog

Author: isc-pbarton

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - Web UI includes a "Push Branch" button for local branches that are ahead of upstream
+- Support for making the Settings UI read-only through `##class(SourceControl.Git.API).Configure()` (#258)
 
 ### Fixed
 - Studio export path doesn't get weird mixed slahes on Windows (#252)