[android] Update changelog for the v8.4.0-alpha.1 release (#15561)

platform/android/CHANGELOG.md

@@ -3,17 +3,28 @@
 Mapbox welcomes participation and contributions from everyone.  If you'd like to do so please see the [`Contributing Guide`](https://github.com/mapbox/mapbox-gl-native/blob/master/CONTRIBUTING.md) first to get started.
 
 ## master
+
+## 8.4.0-alpha.1 - September 4, 2019
+[Changes](https://github.com/mapbox/mapbox-gl-native/compare/android-v8.3.0...android-v8.4.0-alpha.1) since [Mapbox Maps SDK for Android v8.3.0](https://github.com/mapbox/mapbox-gl-native/releases/tag/android-v8.3.0):
+
 ### Features
  - Introduce `clusterProperties` option for aggregated cluster properties. [#15425](https://github.com/mapbox/mapbox-gl-native/pull/15425)
  - Expose the `CameraPosition#padding` field and associated utility camera position builders. This gives a choice to set a persisting map padding immediately during a transition instead of setting it lazily `MapboxMap#setPadding`, which required scheduling additional transition to be applied. This also deprecates `MapboxMap#setPadding` as there should be no need for a lazy padding setter. [#15444](https://github.com/mapbox/mapbox-gl-native/pull/15444)
  - Add number-format expression that allows to format a number to a string, with configurations as minimal/maximal fraction and locale/currency. [#15424](https://github.com/mapbox/mapbox-gl-native/pull/15424)
  - Enable using of `text-offset` option together with `text-variable-anchor` (if `text-radial-offset` option is not provided). If used with `text-variable-anchor`, input values will be taken as absolute values. Offsets along the x- and y-axis will be applied automatically based on the anchor position. [#15542](https://github.com/mapbox/mapbox-gl-native/pull/15542)
 
- ### Performance improvements
- - Mark used offline region resources in batches. [#15521](https://github.com/mapbox/mapbox-gl-native/pull/15521)
-
 ### Bug fixes
  - Fixed a rendering issue of `collisionBox` when `text-translate` or `icon-translate` is enabled. [#15467](https://github.com/mapbox/mapbox-gl-native/pull/15467)
+- Fixed unnecessary layers blink when the same components are re-added after the style reload [#15513](https://github.com/mapbox/mapbox-gl-native/pull/15513)
+- Fixed an issue in JNI marshaling code that converted a float to long that produced invalid expressions [#15557](https://github.com/mapbox/mapbox-gl-native/pull/15557)
+- Call callback onFinish() immediately when trying to move camera to current position [#15558](https://github.com/mapbox/mapbox-gl-native/pull/15558)
+
+### Performance improvements
+ - Mark used offline region resources in batches. [#15521](https://github.com/mapbox/mapbox-gl-native/pull/15521)
+
+### Other Changes
+- JNI binding refactor [#15462](https://github.com/mapbox/mapbox-gl-native/pull/15462)
+- Javadoc changes to clarify OfflineManager methods [#15519](https://github.com/mapbox/mapbox-gl-native/pull/15519)
 
 ## 8.3.0 - August 28, 2019
 [Changes](https://github.com/mapbox/mapbox-gl-native/compare/android-v8.3.0-beta.1...android-v8.3.0) since [Mapbox Maps SDK for Android v8.3.0-beta.1](https://github.com/mapbox/mapbox-gl-native/releases/tag/android-v8.3.0-beta.1):