Issue reference:

Submission Checklist:

• Have you followed the guidelines in our Contributing document (for example, is your tree a clean merge)?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Does your submission build?
• Does your submission pass tests?
• Have you run lints on your code locally prior to submission?
• Have you updated all of the cabal/nix infrastructure?
• Is this a breaking change? Have you discussed this?

The contributing doc 404s when I clicked it.

https://github.com/onrock-eng/github-webhooks/CONTRIBUTING.md

This is an extension of @TomMD's work in #14 that should pass CI sincestack --test ghci pretty pretty-show github-webhooks aeson bytestring works for me locally