Added change log

Author: eeisegn

CHANGELOG.md

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+# 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]
+### Added
+- Upcoming changes...
+
+## [0.5.5] - 2021-07-09
+### Added
+- Added input SBOM JSON validation
+- Added REST POST retry logic
+
+## [0.5.4] - 2021-07-08
+### Added
+- Added --ignore option to scan command
+
+## [0.5.2] - 2021-06-29
+### Fixed
+- Fixed filtering bug