Update Changelog

CHANGELOG.md

@@ -4,6 +4,18 @@ All notable changes to thoth will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [[0.4.6]](https://github.com/thoth-pub/thoth/releases/tag/v0.4.6) - 2021-09-02
+### Added
+  - [#88](https://github.com/thoth-pub/thoth/issues/88) - Implement KBART specification
+  - [#266](https://github.com/thoth-pub/thoth/issues/266) - Delete confirmation to publications
+
+### Changed
+  - [#272](https://github.com/thoth-pub/thoth/issues/272) - Use more fields in `contributors` filtering
+
+### Fixed
+  - [#271](https://github.com/thoth-pub/thoth/issues/271) - Make filter parameter optional in `subjectCount`
+
+
 ## [[0.4.5]](https://github.com/thoth-pub/thoth/releases/tag/v0.4.5) - 2021-08-12
 ### Added
   - [#259](https://github.com/thoth-pub/thoth/issues/259) - Units selection dropdown to Work and NewWork pages, which updates the Width/Height display on change