Add CHANGELOG

CHANGELOG.md

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+# Changelog
+
+All notable changes to HapLink.jl 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]
+
+## [0.3.0]
+
+## Added
+
+- Crosschecks for SAM and BAM ([#29](https://github.com/BioJulia/XAM.jl/pull/29))
+- Improved documentation for flags ([#43](https://github.com/BioJulia/XAM.jl/pull/43))
+
+### Changed
+
+- `BAM.quality` performance improved ([#21](https://github.com/BioJulia/XAM.jl/issues/21))
+- Updated BioAlignments to v2.2 and BioSequences to v3 ([#48](https://github.com/BioJulia/XAM.jl/pull/48))
+
+### Fixed
+
+- `BAM.Record` layout now matches the BAM specs ([#26](https://github.com/BioJulia/XAM.jl/pull/26))
+
+[Unreleased]: https://github.com/BioJulia/XAM.jl/compare/v0.3.0...HEAD
+[0.3.0]: https://github.com/BioJulia/XAM.jl/compare/v0.2.8...v0.3.0