Create CHANGELOG.md

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] - yyyy-mm-dd
+
+
+## [0.1.0-beta2.0] - 2021-03-04
+
+Migration: config file changed, all siridb related config is in a seperate settings.enodo file in the root of the data folder you give up within the conf file.
+
+### Added
+
+- Environment variable support
+- Default config can be created by running listener with `--create_config`
+
+### Changed
+
+
+### Fixed
+