Update changelog for AppConfig release
# Release History
-## 0.3.0 (Unreleased)
-
-### Features Added
+## 0.3.0 (2022-05-10)
### Breaking Changes
* Changed argument semantics of `AddSetting`, `DeleteSetting`, `GetSetting`, `SetSetting`, and `SetReadOnly`.
-### Bugs Fixed
-
-### Other Changes
-
## 0.2.0 (2022-04-20)
### Breaking Changes
