Bump json-schema from 0.2.3 to 0.4.0 (#673)

Bumps [json-schema](https://github.com/kriszyp/json-schema) from 0.2.3 to 0.4.0.
- [Release notes](https://github.com/kriszyp/json-schema/releases)
- [Commits](kriszyp/json-schema@v0.2.3...v0.4.0)

---
updated-dependencies:
- dependency-name: json-schema
  dependency-type: indirect
...

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