CHANGELOG.md: document prior changes

Author: oxzi

CHANGELOG.md

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+<!--
+SPDX-FileCopyrightText: Alvar Penning
+
+SPDX-License-Identifier: BSD-3-Clause
+-->
+
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog][keep-a-changelog], and this project adheres to [Semantic Versioning][semantic-versioning].
+
+## [Unreleased]
+### Added
+- generator/gen.go: syscall group description with auto-generated package documentation
+- Write CHANGELOG for all prior changes.
+
+### Changed
+- syscalls: bump systemd 252 -> 254
+- Bump Go and CI dependencies
+- Remove year in copyright headers
+
+### Fixed
+- generator/gen.go: fix for systemd 254's new format
+
+## [0.1.4] - 2022-12-04
+### Changed
+- update module github.com/elastic/go-seccomp-bpf to v1.3.0
+
+## [0.1.3] - 2022-11-19
+### Added
+- Configure Renovate
+
+### Changed
+- syscalls: bump systemd 251 -> 252
+- Bump Go and CI dependencies
+
+## [0.1.2] - 2022-11-02
+### Fixed
+- generator: prevent duplicates and sort syscalls
+
+## [0.1.1] - 2022-10-08
+### Changed
+- syscalls: bump systemd 250 -> 251
+
+## [0.1.0] - 2022-03-10
+### Added
+- First release with working code.
+
+[keep-a-changelog]: https://keepachangelog.com/en/1.1.0/
+[semantic-versioning]: https://semver.org/spec/v2.0.0.html
+
+[unreleased]: https://github.com/oxzi/syscallset-go/compare/v0.1.4..HEAD
+[0.1.4]: https://github.com/oxzi/syscallset-go/compare/v0.1.3..v0.1.4
+[0.1.3]: https://github.com/oxzi/syscallset-go/compare/v0.1.2..v0.1.3
+[0.1.2]: https://github.com/oxzi/syscallset-go/compare/v0.1.1..v0.1.2
+[0.1.1]: https://github.com/oxzi/syscallset-go/compare/v0.1.0..v0.1.1
+[0.1.0]: https://github.com/oxzi/syscallset-go/releases/tag/v0.1.0