bindings: Start changelog notes for next release

Author: the-mikedavis

bindings/CHANGELOG.md

@@ -5,7 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-<!-- ## [Unreleased] -->
+## [Unreleased]
+
+### Added
+
+* Added `Node::is_extra`
 
 ## [v0.2.0] - 2025-06-06