CHANGELOG.md in queue-bus-0.12.0 vs CHANGELOG.md in queue-bus-0.13.0

@@ -4,9 +4,15 @@
 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]
 
+## [0.13.0]
+
+### Added
+
+- Adds `Dispatch#on_heartbeat` which is a helper function for specifying heartbeat subscriptions.
+
 ## [0.12.0]
 
 ### Changed
 - Pipelines fetching all queue subscriptions when using `QueueBus::Application.all`