Changelog update

Author: modrimkus-unity

CHANGELOG.md

@@ -5,6 +5,12 @@ 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/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Bug Fixes
+
+- [case: 1332226] Fixed issue where some Gizmos menu items would be missing in projects that have ProBuilder package installed.
+
 ## [4.5.1] - 2021-02-04
 
 ### Bug Fixes