Update CHANGELOG.md

Author: aidanharan

CHANGELOG.md

@@ -15,5 +15,6 @@
 
 - [#1215](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1215) Fix mismatched foreign key errors
 - [#1228](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1228) Enable identity insert on view's base table
+- [#1238](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/1238) Allow INSERT statements with SELECT notation
 
 Please check [7-1-stable](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/blob/7-1-stable/CHANGELOG.md) for previous changes.