Update CHANGELOG.md before 5.0.0-dev6 (#5808)

Author: achamayou

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 [5.0.0-dev6]: https://github.com/microsoft/CCF/releases/tag/ccf-5.0.0-dev6
 
 - Lifted parser size limits on forwarded request from default values to more permissive ones. Note that the limits set out on the interface of the inbound node still apply (#5803).
+- [ccf.crypto.unwrapKey()](https://microsoft.github.io/CCF/main/js/ccf-app/functions/crypto.unwrapKey.html) has been added to the JS API (#5792).
 
 ## [5.0.0-dev5]