Changelog markdown file added.

Author: simzer

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+## [0.3.1] - 2021-09-24
+
+### Fixed
+
+- Data cube input recognition runtime error fixed.
+
+## [0.3.0] - 2021-09-23
+
+### Added
+
+- First public release