Update CHANGELOG.md

Co-authored-by: Ture Gjørup <ture@ignatz.dk>

Author: tuj

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 ## [Unreleased]
 
 - [#223](https://github.com/os2display/display-api-service/pull/223)
-  - Fixed broken tests.
+  - Added explicit fixtures to avoid false negatives in the test suite
 - [#219](https://github.com/os2display/display-api-service/pull/219)
   - Fixed psalm, test, coding standards and updated api spec.