Fix CHANGELOG

Author: mpkorstanje

CHANGELOG.md

@@ -10,7 +10,7 @@ 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]
-## Fixed
+### Fixed
 - [Core] Remove Jackson services from `META-INF/services` ([#2621](https://github.com/cucumber/cucumber-jvm/issues/2607) M.P. Korstanje)
 - [JUnit Platform] Use JUnit Platform 1.9.1 (JUnit Jupiter 5.9.1)