Adds a CHANGELOG

fixes #3

Author: warmwaffles

CHANGELOG

@@ -0,0 +1,15 @@
+# Changelog
+
+All notable changes will be documented in this file.
+
+The format is based on [Keep a Changelog][keepachangelog], and this project
+adheres to [Semantic Versioning][semver].
+
+## [Unreleased]
+
+## [0.5.0] - 2021-03-17
+
+- Initial release.
+
+[keepachangelog]: <https://keepachangelog.com/en/1.0.0/>
+[semver]: <https://semver.org/spec/v2.0.0.html>