change header

Author: roninopf

CHANGELOG.md

@@ -3,7 +3,7 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### 6.4.9
-### Changed
+### Added
 [Version version 6.4.9](https://github.com/Iterable/swift-sdk/releases/tag/6.4.9) of Iterable's iOS SDK makes it possible to store in-app messages in memory, rather than in an unencrypted local file. However, an unencrypted local file is still the default option.
 
 To store in-app messages in memory, set `useInMemoryStorageForInApps` to true: