Update changelog

Author: westracer

flutter_secure_storage/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 * Enabled StrongBox by default, use fallback if it's not available.
 * [Android] Method to check if an Android device supports Strongbox
+* [iOS] Add option to use secure enclave (based on [#989 PR](https://github.com/juliansteenbakker/flutter_secure_storage/pull/989))
 
 ## 10.0.0
 This major release brings significant security improvements, platform updates, and modernization across all supported platforms.