update CHANGELOG.md

Author: davidjgoss

CHANGELOG.md

@@ -1,3 +1,4 @@
+
 # Changelog
 
 All notable changes to this project will be documented in this file.
@@ -8,6 +9,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 Please see [CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CONTRIBUTING.md) on how to contribute to Cucumber.
 
 ## [Unreleased]
+### Fixed
+- Ensure durations are integers in JSON formatter ([#2094](https://github.com/cucumber/cucumber-js/pull/2094))
 
 ## [8.5.0] - 2022-07-19
 ### Changed