Update CHANGELOG

Author: iarata

packages/health/CHANGELOG.md

@@ -3,6 +3,7 @@
 * iOS: Add `deviceModel` in returned Health data to identify the device that generated the data of the receiver. (in iOS `source_name` represents the revision of the source responsible for saving the receiver.)
 * Android: Add read health data in background - PR [#1184](https://github.com/cph-cachet/flutter-plugins/pull/1184)
 * Fix [#1169](https://github.com/cph-cachet/flutter-plugins/issues/1169) where `meal_type` property in `Nutrition` was null always
+* iOS: Add `CARDIO_DANCE` HealthDataType - [#1146](https://github.com/cph-cachet/flutter-plugins/pull/1146)
 
 ## 12.1.0