aws-sns-verify-0.0.0.0: CHANGELOG.md

## [_Unreleased_](https://github.com/freckle/aws-sns-verify/compare/v0.0.0.0...main)

## [v0.0.0.0](https://github.com/freckle/aws-sns-verify/releases/tag/v0.0.0.0)

- Initial release.
- Handle JSON parsing.
- Handle validation of payload signatures via X509.
- Handle response to subscription messages.