chore(deps): bump json from 1.8.6 to 2.3.0 (#77)

Bumps [json](https://github.com/ruby/json) from 1.8.6 to 2.3.0.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](ruby/json@v1.8.6...v2.3.0)

---
updated-dependencies:
- dependency-name: json
  dependency-version: 2.3.0
  dependency-type: indirect
...

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Author: dependabot[bot]