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](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.3.0] - 2024-08-14
+
+### Changed
+- Breaking: the return type of the `Neighbours` method in the `astar.Graph[Node]`
+  interface changed from `[]Node` to `iter.Seq[Node]`
+- The project now requires Go >= 1.23.0
+
+## [0.2.0] - 2022-03-15
+
+### Changed
+- Breaking: the functions now use type parameters (generics)
+  for the `Node` type instead of `type Node interface{}`
+- The project now requires Go >= 1.18.0
+
+## [0.1.0] - 2021-01-31
+
+### Added
+- Initial release
+
+[0.3.0]: https://github.com/fzipp/astar/compare/v0.2.0...v0.3.0
+[0.2.0]: https://github.com/fzipp/astar/compare/v0.1.0...v0.2.0
+[0.1.0]: https://github.com/fzipp/astar/releases/tag/v0.1.0