docs: add CHANGELOG.md

Author: yupix

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased]
+
+### Added
+
+- add CHANGELOG.md
+- add README.md
+- add LICENSE
+- add Each event method
+
+
+
+
+[Unreleased]: https://github.com/yupix/mi.py/compare/master...HEAD