[Security] Bump is-my-json-valid from 2.16.0 to 2.20.0 in /src/API
[Security] Bump is-my-json-valid from 2.16.0 to 2.20.0 in /src/API

Bumps [is-my-json-valid](https://github.com/mafintosh/is-my-json-valid) from 2.16.0 to 2.20.0. **This update includes security fixes.**
- [Release notes](https://github.com/mafintosh/is-my-json-valid/releases)
- [Commits](https://github.com/mafintosh/is-my-json-valid/compare/v2.16.0...v2.20.0)
martincostello/api,martincostello/api,martincostello/api