changelog added

Author: Chris Foulston

CHANGELOG.md

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+# Changelog
+All notable changes to this package 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).
+
+## [1.0.0] - 2020-05-12
+
+### Added
+ - Support for managed reference property type in "IsTypeExpandable"
+
+### Changed
+- Improved layout and styling for 2019.3. 
+
+### Fixed
+ - Fixed accessing EditorStyles before GUI Skin was loaded.