Update CHANGELOG.md

Author: skryukov

CHANGELOG.md

@@ -3,6 +3,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+## Unreleased
+
+### Added
+
+* Inertia Rails documentation (@skryukov)
 
 ## [3.2.0] - 2024-06-19