Update CHANGELOG.md

com.sebaslab.svelto.ecs/CHANGELOG.md

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 # Changelog
 All notable changes to this project will be documented in this file. Changes are listed in random order of importance.
 
+## [3.3.1] - 26-2022
+
+* Fixed serious bug that would affect the new IReactOnRemoveEx callbacks
+
 ## [3.3.0] - 04-2022
 
 * INeedEGID and INeedEntityReference interfaces are not deprecated, but still available for backwards compatibility through the define SLOW_SVELTO_SUBMISSION