INT-2955: Added changelog message

Author: tiny-james

CHANGELOG.md

@@ -4,6 +4,10 @@ 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
+### Fixed
+- Find an associated form even when in a nested shadow DOM.
+
 ## 2.0.0
 ### Changed
 - License changed to MIT (from Apache 2) this matches TinyMCE 6 license