Update CHANGELOG.md

Author: uerceg

CHANGELOG.md

@@ -553,6 +553,7 @@
 [ios_sdk_v4.14.1]: https://github.com/adjust/ios_sdk/tree/v4.14.1
 [ios_sdk_v4.15.0]: https://github.com/adjust/ios_sdk/tree/v4.15.0
 [ios_sdk_v4.17.1]: https://github.com/adjust/ios_sdk/tree/v4.17.1
+[ios_sdk_v4.17.2]: https://github.com/adjust/ios_sdk/tree/v4.17.2
 
 [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