Update changelog for #2643

Author: friedbunny

CHANGELOG.md

@@ -13,6 +13,7 @@
 - `-mapViewRegionIsChanging:` is now sent to the map view’s delegate during gestures. ([#2700](https://github.com/mapbox/mapbox-gl-native/pull/2700))
 - Improved gesture recognition while the map is tilted. ([#2770](https://github.com/mapbox/mapbox-gl-native/pull/2770))
 - Removed CoreTelephony.framework dependency. ([#2581](https://github.com/mapbox/mapbox-gl-native/pull/2581))
+- Improved user location annotation responsiveness. ([#2643](https://github.com/mapbox/mapbox-gl-native/pull/2643))
 
 ## iOS 2.1.2