Modified CHANGELOG.md
The changelog for [Kommunicate-Android-Chat-SDK](https://github.com/Kommunicate-io/Kommunicate-Android-Chat-SDK). Also see the
[releases](https://github.com/Kommunicate-io/Kommunicate-Android-Chat-SDK/releases) on Github.
+## Unreleased
+1) Added platform flag
+
## Kommunicate Android SDK 2.5.3
1) Auto Suggestion Button color customization
2) Added support for AES256 encryption and decryption
