chore: update CHANGELOG for version 2.0.4

Author: lposen

CHANGELOG.md

@@ -1,3 +1,15 @@
+## 2.0.4
+
+## Updates
+- Added API documentation via Netlify([1087275](https://github.com/Iterable/react-native-sdk/commit/1087275))
+- Removed dependency on `react-native-vector-icons`, per issues
+  [#513](https://github.com/Iterable/react-native-sdk/issues/513),
+ [#683](https://github.com/Iterable/react-native-sdk/issues/683) and
+ [#675](https://github.com/Iterable/react-native-sdk/issues/675)
+ ([6ece6e0](https://github.com/Iterable/react-native-sdk/commit/6ece6e0))
+- Updated dependencies
+- Added unit tests
+
 ## 2.0.3
 
 ### Updates