Added 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](https://keepachangelog.com/en/1.0.0/),
+
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [v9.0.0] - 02.04.2019
+
+### Added
+
+- This changelog!
+- Initial support for using Rollup to build packages. Use `rbuild` and `rdev`.
+
+### Changed
+
+- Updated old Babel packages
+
+### Deprecated
+
+- Webpack support. Will be removed in next version.