📝 Update changelog.

Author: Raphael Krupinski

ChangeLog.md

@@ -5,17 +5,18 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html),
 and the format of this file is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
-## [Unreleased]
+## [0.9.0]
 ### Added
-- GitHub Action configuration for pytest, pre-commit and publishing a package.
-- Pre-commit configuration with mypy and pylint.
+- Added a default user-agent header.
 
 ### Changed
-- Split code to separate repositories. Move code generator and OpenAPI document model classes to lapidary-render repository.
 - Changed the programming paradigm from dynamic with scaffolding to declarative via annotations.
+- Changed authentication model to NamedAuth and factory functions.
+- Updated required python version to 3.9, following httpx-auth
 
 ### Removed
-- Support for invalid HTTP status codes patterns, like 20X ([OAS3.1 4.8.16.2](https://spec.openapis.org/oas/v3.1.0#patterned-fields-0)).
+- Removed support for invalid HTTP status codes patterns, like 20X ([OAS3.1 4.8.16.2](https://spec.openapis.org/oas/v3.1.0#patterned-fields-0)).
+- Removed Absent class.
 
 ## [0.8.0](https://github.com/python-lapidary/lapidary/releases/tag/v0.8.0) - 2023-01-02
 ### Added