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).
+
+## [Unreleased]
+
+## [1.0.1] - 2020-04-05
+
+### Changed
+
+- Switched to using `technic.pretty_num` instead of `technic.EU_string` for compatibility.
+- Small changes to README to improve readability.
+- Node now drops empty powerbank instead of nothing if it gets dug (though this should never happen normally).
+
+### Fixed
+
+- Duplication bug with nodes that take the wielded itemstack on right-click (such as `xdecor` item frames).
+
+## 1.0.0 - 2019-12-14
+
+- Initial versioned release.
+
+[Unreleased]: https://github.com/OgelGames/powerbanks/compare/v1.0.1...HEAD
+[1.0.1]: https://github.com/OgelGames/powerbanks/compare/v1.0.0...v1.0.1