CHANGELOG.md update

Author: uerceg

CHANGELOG.md

@@ -1,3 +1,17 @@
+### Version 4.21.1 (9th April 2020)
+#### Added
+- Added support for Huawei App Gallery install referrer.
+
+#### Changed
+- Updated communication flow with `iAd.framework`.
+
+#### Native SDKs
+- [[email protected]][ios_sdk_v4.21.1]
+- [[email protected]][android_sdk_v4.21.1]
+- [[email protected]][windows_sdk_v4.17.0]
+
+---
+
 ### Version 4.21.0 (31st March 2020)
 #### Added
 - Added support for signature library as a plugin.
@@ -683,6 +697,7 @@
 [ios_sdk_v4.19.0]: https://github.com/adjust/ios_sdk/tree/v4.19.0
 [ios_sdk_v4.20.0]: https://github.com/adjust/ios_sdk/tree/v4.20.0
 [ios_sdk_v4.21.0]: https://github.com/adjust/ios_sdk/tree/v4.21.0
+[ios_sdk_v4.21.1]: https://github.com/adjust/ios_sdk/tree/v4.21.1
 
 [android_sdk_v3.5.0]: https://github.com/adjust/android_sdk/tree/v3.5.0
 [android_sdk_v4.1.0]: https://github.com/adjust/android_sdk/tree/v4.1.0
@@ -708,6 +723,7 @@
 [android_sdk_v4.19.1]: https://github.com/adjust/android_sdk/tree/v4.19.1
 [android_sdk_v4.20.0]: https://github.com/adjust/android_sdk/tree/v4.20.0
 [android_sdk_v4.21.0]: https://github.com/adjust/android_sdk/tree/v4.21.0
+[android_sdk_v4.21.1]: https://github.com/adjust/android_sdk/tree/v4.21.1
 
 [windows_sdk_v4.12.0]: https://github.com/adjust/windows_sdk/tree/v4.12.0
 [windows_sdk_v4.13.0]: https://github.com/adjust/windows_sdk/tree/v4.13.0