Update CHANGELOG.md

Author: tillsteinbach

CHANGELOG.md

@@ -3,6 +3,11 @@
 All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
+- No unreleased changes so far
+
+## [0.20.5] - 2021-09-02
+### Fixed
+- Fixed UnboundLocalError in condition GDC_MISSING
 
 ## [0.20.4] - 2021-09-01
 ### Fixed
@@ -263,7 +268,8 @@ Minor fix in observer interface
 ## [0.1.0] - 2021-05-26
 Initial release
 
-[unreleased]: https://github.com/tillsteinbach/WeConnect-python/compare/v0.20.4...HEAD
+[unreleased]: https://github.com/tillsteinbach/WeConnect-python/compare/v0.20.5...HEAD
+[0.20.5]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.20.5
 [0.20.4]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.20.4
 [0.20.3]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.20.3
 [0.20.2]: https://github.com/tillsteinbach/WeConnect-python/releases/tag/v0.20.2