Add changelog

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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+<!-- next-header -->
+## [Unreleased] - ReleaseDate
+
+## [0.2.0] - 2024-02-17
+
+## Changed
+
+- [breaking-change] Use an unconnected socket as the argument and pass in the inital server address to fix #1
+
+## [0.1.0] - 2023-08-21
+
+Initial release
+
+<!-- next-url -->
+[Unreleased]: https://github.com/kiranshila/tftp_client/compare/v0.2.0...HEAD
+[0.2.0]: https://github.com/kiranshila/tftp_client/compare/v0.1.0...v0.2.0