Added CHANGELOG

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+Given the high speed of development in the first phase, changes are being reported only starting from v0.20.2.
+
+## [0.20.3] - 2021-02-28
+
+### Fixed
+
+- Several bug fixes on the VLC plugin, including proper management of stop/end-of-stream, volume set and missing integration requirements in `requirements.txt` and `setup.py`.
+
+## [0.20.2] - 2021-02-27
+
+### Fixed
+
+- More stable ZeroConf backends registration logic in case of partial or missing results.
+- Improved and refactored integration tests.
+
+### Added
+
+- Support for passing context variables (${}) from YAML procedures/hooks/crons to Python procedure/hooks/crons.
+- New integration test for testing procedures.