updated changelog

Author: pschraut

CHANGELOG.md

@@ -4,6 +4,9 @@ All notable changes to this package are 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).
 
+## [4.0.0] - 2021-??-??
+### Fixed
+ - Fixed search regression introduced in 3.9.0. Thanks to jojo59516 for the fix. See [PR#10](https://github.com/pschraut/UnityHeapExplorer/pull/10) for details.
 
 ## [3.9.0] - 2021-04-11
 ### Added