Start maintaining a CHANGELOG

Author: tazend

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [21.8.0](https://github.com/PySlurm/pyslurm/releases/tag/v21.8.0) - 2022-03-01
+
+### Added
+
+- Support for Slurm 21.8.x ([PR #227](https://github.com/PySlurm/pyslurm/pull/227) by [rezib](https://github.com/rezib), [njcarriero](https://github.com/njcarriero))
+
+### Fixed
+
+- Fixed typo in slurmdb job dict: `user_cpu_sec` -> `user_cpu_usec` ([3c5ffad](https://github.com/PySlurm/pyslurm/pull/227/commits/3c5ffad8e177a3386f9aeecb3dacceb77d08a760) in [PR #227](https://github.com/PySlurm/pyslurm/pull/227) by [rezib](https://github.com/rezib))