Add changelog file

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/)
+* This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html)
+
+## [Unreleased]
+### Fixed
+- Fix `Ecto.Query.dynamic_expr()` type naming after Ecto version upgrade.
+- Fix any other issues indicated by Credo and Dialyzer (#19).
+
+## [v0.2.2]
+### Fixed
+- Fix warnings affecting compilation and runtime (#16).
+
+## [v0.2.1]
+### Fixed
+- Fix query building when no joins are specified (#14).
+
+## [v0.2.0]
+### Added
+- Allow nesting association-based conditions (curiosum-dev/permit#36). For example, predicates such as `read(Item, user: [id: user_id])` can now be written.
+
+## [v0.1.1]
+### Fixed
+- Fix action traversal issue (#4).
+
+## [v0.1.0]
+Initial release.