Implement a changelog

Author: colinodell

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]
+
+### Added
+ - Added support for both `.` and `/`-delimited key paths (#24)
+ - Added parameter and return types to everything; enabled strict type checks (#18)
+ - Added new exception classes to better identify certain types of errors (#20)
+ - `Data` now implements `ArrayAccess` (#17)
+
+### Changed
+ - All thrown exceptions are now instances or subclasses of `DataException` (#20)
+ - Calling `get()` on a missing key path without providing a default will throw a `MissingPathException` instead of returning `null` (#29)
+ - Bumped supported PHP versions to 7.1 - 8.x (#18)
+
+## [2.0.0] - 2017-12-21
+
+### Changed
+ - Bumped supported PHP versions to 7.0 - 7.4 (#12)
+ - Switched to PSR-4 autoloading
+
+## [1.1.0] - 2017-01-20
+
+### Added
+ - Added new `has()` method to check for the existence of the given key (#4, #7)
+
+## [1.0.1] - 2015-08-12
+
+### Added
+ - Added new optional `$default` parameter to the `get()` method (#2)
+
+## [1.0.0] - 2012-07-17
+
+**Initial release!**
+
+[Unreleased]: https://github.com/dflydev/dflydev-dot-access-data/compare/v2.0.0...main
+[2.0.0]: https://github.com/dflydev/dflydev-dot-access-data/compare/v1.1.0...v2.0.0
+[1.1.0]: https://github.com/dflydev/dflydev-dot-access-data/compare/v1.0.1...v1.1.0
+[1.0.1]: https://github.com/dflydev/dflydev-dot-access-data/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/dflydev/dflydev-dot-access-data/releases/tag/v1.0.0