Update missing changelog (#652)

## Checklist

<!-- Make sure all of these are complete -->

- [X] Linked relevant issue
- [X] Updated relevant documentation
- [X] Added relevant tests
- [X] Performed self-review of the code
- [X] Added changes to `CHANGELOG.md`

Author: THenry14

CHANGELOG.md

@@ -20,6 +20,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Cast
 
+#### Added
+
+- support for starkli-style accounts, allowing the use of existing accounts
+
 #### Changed
 
 - fixed misleading error message when there was no scarb in PATH and `--path-to-scarb-toml` was passed