Add changelog

Author: pappasam

CHANGELOG.md

@@ -0,0 +1,21 @@
+# 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).
+
+## 0.3.0
+
+### Added
+
+* This `CHANGELOG.md`
+* Support for `textDocument/documentSymbol`
+
+### Changed
+
+* `locations_from_definitions` to `get_location_from_definition`. More generally useful.
+
+### Fixed
+
+* `mypy`, `pylint`, `black`, `toml-sort`, and `isort` all pass.