docs: Update CHANGELOG with v1.9.0 (#647)

* docs: Update CHANGELOG with `v1.9.0`

Author: yermulnik

CHANGELOG.md

@@ -7,6 +7,18 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org).
 
+## [v1.9.0](https://github.com/warrensbox/terraform-switcher/tree/v1.9.0) - 2025-10-31
+
+[Full Changelog](https://github.com/warrensbox/terraform-switcher/compare/v1.8.0...v1.9.0)
+
+### Added
+
+- feat(terragrunt): Support `root.hcl` and custom file name [#644](https://github.com/warrensbox/terraform-switcher/pull/644) ([yermulnik](https://github.com/yermulnik))
+
+### Other
+
+- docs: Update CHANGELOG with `v1.9.0` [#647](https://github.com/warrensbox/terraform-switcher/pull/647) ([yermulnik](https://github.com/yermulnik))
+
 ## [v1.8.0](https://github.com/warrensbox/terraform-switcher/tree/v1.8.0) - 2025-10-23
 
 [Full Changelog](https://github.com/warrensbox/terraform-switcher/compare/v1.7.0...v1.8.0)