Update CHANGELOG for release (#181)

Author: cmaier

CHANGELOG.md

@@ -3,14 +3,19 @@ All notable changes to this project will be documented in this file.
 
 ## UNRELEASED
 ### Added
+### Changed
+### Removed
+### Fixed
+
+## [0.73.0]
+### Added
 * ui/ui-toolkit: i18n using the Lokalise
 * Autofill support for PAYONE credit card forms
 * core/ui: Add support for project specific custom properties
   * Make the external billing subject text max length configurable
-### Changed
+  * BREAKING CHANGE in ui module due to restricted API usage the unused SnackbarPushUpBehavior has been removed
 ### Removed
 * ui: Remove phrase for i18n
-### Fixed
 
 ## [0.72.5]
 ### Changed