Update changelog

Author: joverlee521

CHANGELOG.md

@@ -3,6 +3,8 @@
 * Fix bug where app crashed if measurements JSON did not define thresholds ([#1802](https://github.com/nextstrain/auspice/pull/1802))
 * Fix bug where measurements display did not honor the default `measurements_display` ([#1802](https://github.com/nextstrain/auspice/pull/1802))
 * Only display download-JSON button if the dataset name can be parsed from pathname ([#1804](https://github.com/nextstrain/auspice/pull/1804))
+* Fix bug where measurements panel did not display means for measurements that had an "undefined" coloring ([#1827](https://github.com/nextstrain/auspice/pull/1827))
+* Measurement panel's x-axis min/max values are now limited by visible measurements ([#1827](https://github.com/nextstrain/auspice/pull/1827))
 
 ## version 2.56.0 - 2024/07/01