Update Changelog

CHANGELOG.md

@@ -4,6 +4,13 @@ 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).
 
+## [[0.4.3]](https://github.com/thoth-pub/thoth/releases/tag/v0.4.3) - 2021-07-28
+### Added
+  - [#48](https://github.com/thoth-pub/thoth/issues/48) - Implement OAPEN ONIX 3.0 specification
+
+### Fixed
+  - [#254](https://github.com/thoth-pub/thoth/issues/254) - Ensure order of fields in create work match those in edit work
+
 ## [[0.4.2]](https://github.com/thoth-pub/thoth/releases/tag/v0.4.2) - 2021-07-05
 ### Added
   - [#125](https://github.com/thoth-pub/thoth/issues/125) - Implement `ISBN` type to standardise parsing