Update CHANGELOG.md

Author: uerceg

CHANGELOG.md

@@ -1,3 +1,14 @@
+### Version 4.12.1 (1st February 2018)
+#### Native changes
+- https://github.com/adjust/android_sdk/blob/master/CHANGELOG.md#version-4121-31st-january-2018
+
+#### Native SDKs
+- [[email protected]][ios_sdk_v4.12.1]
+- [[email protected]][android_sdk_v4.12.1]
+- [[email protected]][windows_sdk_v4.12.0]
+
+---
+
 ### Version 4.12.0 (26th January 2018)
 #### Added
 - Added `getAmazonAdId` method to `Adjust` interface.
@@ -423,5 +434,6 @@
 [android_sdk_v4.11.3]: https://github.com/adjust/android_sdk/tree/v4.11.3
 [android_sdk_v4.11.4]: https://github.com/adjust/android_sdk/tree/v4.11.4
 [android_sdk_v4.12.0]: https://github.com/adjust/android_sdk/tree/v4.12.0
+[android_sdk_v4.12.1]: https://github.com/adjust/android_sdk/tree/v4.12.1
 
 [windows_sdk_v4.12.0]: https://github.com/adjust/windows_sdk/tree/v4.12.0