Update changelog

Author: alexrudall

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Add vision as permitted purpose for files - thanks to [@willywg](https://github.com/willywg) for the PR.
+- Add improved README example of tool calling - thanks [@krschacht](https://github.com/krschacht) - check out his project [HostedGPT](https://github.com/AllYourBot/hostedgpt)!
 
 ## [7.0.1] - 2024-04-30