[android][ios] Change log entries

platform/android/CHANGELOG.md

@@ -13,6 +13,7 @@ Mapbox welcomes participation and contributions from everyone.  If you'd like to
  - Suppress network requests for expired tiles update, if these tiles are invisible. [#15741](https://github.com/mapbox/mapbox-gl-native/pull/15741)
  - Fixed opacity interpolation for composition expressions [#15738](https://github.com/mapbox/mapbox-gl-native/pull/15738)
  - Fixed an issue where `Projection#getMetersPerPixelAtLatitude` returned a value incorrectly divided by the pixel ratio. This also fixes an issue where `LocationComponent` accuracy circle's radius was artificially increased. [#15742](https://github.com/mapbox/mapbox-gl-native/pull/15742)
+ - Coalesce requests to the client for the same missing image [#15778](https://github.com/mapbox/mapbox-gl-native/pull/15778)
 
 ## 8.4.0 - September 25, 2019
 [Changes](https://github.com/mapbox/mapbox-gl-native/compare/android-v8.4.0-beta.1...android-v8.4.0) since [Mapbox Maps SDK for Android v8.4.0-beta.1](https://github.com/mapbox/mapbox-gl-native/releases/tag/android-v8.4.0-beta.1): 

platform/ios/CHANGELOG.md

@@ -2,11 +2,17 @@
 
 Mapbox welcomes participation and contributions from everyone. Please read [CONTRIBUTING.md](../../CONTRIBUTING.md) to get started.
 
+## master
+
+### Other changes
+
+* Coalesce requests to the client for the same missing image ([#15778](https://github.com/mapbox/mapbox-gl-native/pull/15778))
+
 ## 5.5.0
 
 ### Performance improvements
 
- * Improved rendering performance for the styles with multiple sources ([#15756](https://github.com/mapbox/mapbox-gl-native/pull/15756))
+* Improved rendering performance for the styles with multiple sources ([#15756](https://github.com/mapbox/mapbox-gl-native/pull/15756))
 
 ### Other changes