Fix typo in changelog

Author: dominikbraun

CHANGELOG.md

@@ -5,7 +5,7 @@ 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).
 
-## [0.22.3] -2023-06-14
+## [0.22.3] - 2023-06-14
 
 ### Changed
 * Changed `StableTopologicalSort` to invoke the `less` function as few as possible, reducing comparisons.