Update changelog

Author: pcisar

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [0.9.0] - 2023-10-05
+
+### Changed
+
+- Build system changed from setuptools to hatch
+- Update dependency to saturnin >=0.9.0
+- Package version is now defined in `saturnin.sdk.__about__.py` (`__version__`)
+
+## [0.8.0] - 2023-04-05
+
+- SDK Milestone 5.
+
+## [0.7.0] - 2021-03-04
+
+- SDK Milestone 4.
+
+## [0.5.0] - 2020-02-27
+
+- SDK Milestone 3.
+
+## [0.4.0] - 2019-10-13
+
+- SDK Milestone 2.
+
+## [0.1.0] - 2018-11-18
+
+Initial release.
+

docs/changelog.rst

@@ -2,6 +2,13 @@
 Changelog
 #########
 
+Version 0.9.0
+=============
+
+- Build system changed from setuptools to hatch
+- Update dependency to saturnin >=0.9.0
+- Package version is now defined in `saturnin.sdk.__about__.py` (`__version__`)
+
 Version 0.8.0
 =============