Update CHANGELOG.md

Author: tillsteinbach

CHANGELOG.md

@@ -2,6 +2,7 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
+## [0.3.0] - 2021-05-28
 ### Added
 - Improved error handling for login
 
@@ -20,7 +21,8 @@ Minor fix in observer interface
 ## [0.1.0] - 2021-05-26
 Initial release
 
-[unreleased]: https://github.com/tillsteinbach/WeConnect-python/compare/v0.2.1...HEAD
+[unreleased]: https://github.com/tillsteinbach/WeConnect-python/compare/v0.3.0...HEAD
+[0.3.0]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.3.0
 [0.2.1]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.2.1
 [0.2.0]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.2.0
 [0.1.1]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.1.1