Fix die bug

CHANGELOG.md

@@ -3,6 +3,9 @@ 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).
 
+## [0.20.1]
+### Fixed
+* Agents would run another step after dying.
 ## [0.20.0]
 ### Added
 * Integration with MESA