Update CHANGELOG.md

Author: femto-code

CHANGELOG.md

@@ -7,8 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 Open for your feature [requests](https://github.com/femto-code/Rasberry-Pi-Dashboard/pulls) or [issues](https://github.com/femto-code/Rasberry-Pi-Dashboard/issues)!
 [https://github.com/femto-code/Rasberry-Pi-Dashboard](https://github.com/femto-code/Rasberry-Pi-Dashboard)
 
-## [0.4] - 2020-08-XX
+## [0.4] - 2020-08-17
 - new authorization/login modal to secure dashboard
+- small shutdown/reboot improvements
 
 ## [0.3] - 2020-07-10
 - new loading screen