feat(release-helper): add shipper-release as sub-project

release-helper/.gitignore

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+/target

release-helper/CHANGELOG.md

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+# Changelog
+
+The format is based on [Keep a Changelog][keep-a-changelog].
+
+[keep-a-changelog]: https://keepachangelog.com/en/1.0.0/
+
+# [Unreleased]
+
+[Unreleased]: https://github.com/shipperstack/shipper-release/compare/0.0.3...HEAD
+
+# [0.0.3] - 2023-07-05
+
+## Changed
+
+- Clean up code with clippy
+- Testing the new release workflow with GitHub Actions
+
+[0.0.3]: https://github.com/shipperstack/shipper-release/compare/0.0.2...0.0.3
+
+# [0.0.2] - 2023-07-05
+
+## Changed
+
+- Fixed a bug where major and minor version increments wouldn't reset the lower version levels
+- The `push` subcommand no longer adds the changed files to git before committing
+- Fixed the changelog extracter including headers into the commit message
+
+[0.0.2]: https://github.com/shipperstack/shipper-release/compare/0.0.1...0.0.2
+
+# [0.0.1] - 2023-07-04
+
+Initial release
+
+[0.0.1]: https://github.com/shipperstack/shipper-release/compare/0e062087e64e764672d496c792bdbafabd264b3b...0.0.1