Add change log

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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [1.1.0] - 2023-07-27
+
+### Added
+
+- `Meta` field to error details.
+- Changelog.
+
+## [1.0.0] - 2022-11-03
+
+### Added
+
+- Initial implementation.
+
+[unreleased]: https://github.com/dnozdrin/errdetail/compare/v1.1.0...HEAD
+[1.1.0]: https://github.com/dnozdrin/errdetail/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/dnozdrin/errdetail/releases/tag/v1.0.0