add changelog for v0.0.2

Signed-off-by: clarinette9 <[email protected]>

CHANGELOG.md

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+<!--
+This changelog should always be read on `master` branch. Its contents on other branches
+does not necessarily reflect the changes.
+-->
+
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+
+## [v0.0.2] - 2021-12-07
+
+### Changed
+- adjust auth header format to enhance authentication and authorization
+
+
+## [v0.0.1] - 2021-10-19
+
+### Added
+- Initial released version
+
+[v0.0.2]: https://github.com/bfenetworks/conf-agent/compare/v0.0.1...v0.0.2
+[v0.0.1]: https://github.com/bfenetworks/conf-agent/releases/tag/v0.0.1