Bump com.cedarsoftware:json-io from 4.28.0 to 4.30.0 (#469)

Bumps [com.cedarsoftware:json-io](https://github.com/jdereg/json-io) from 4.28.0 to 4.30.0.
- [Changelog](https://github.com/jdereg/json-io/blob/master/changelog.md)
- [Commits](jdereg/json-io@4.28.0...4.30.0)

---
updated-dependencies:
- dependency-name: com.cedarsoftware:json-io
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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