CHANGELOG.md: Release v0.2.2 (#10)

Author: phsauter

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+It is updated on each new release based on contributions since the last release.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.2.2 - 2025-06-13
+
+### Added
+
+- Add APB and register_interface wrappers for `obi_uart` peripheral
+- Add new version-level changelog
+
+All prior releases are compatible with this new release.
+