docs: add changelog

Author: shengyuan

CHANGELOG.md

@@ -0,0 +1,16 @@
+# 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]
+
+### Fixed
+
+- Upgrade the modules in package.json [#5](https://github.com/webduinoio/webduino-js/issues/5)
+  - fixed security vulnerabilities
+
+
+[unreleased]: https://github.com/webduinoio/webduino-js/compare/0.6.0...master
+[0.6.0]: https://github.com/webduinoio/webduino-js/releases/tag/0.6.0