Update json requirement from 2.9.0 to 2.9.1 (#69)
Updates the requirements on [json](https://github.com/ruby/json) to permit the latest version.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](https://github.com/ruby/json/compare/v2.9.0...v2.9.1)
---
updated-dependencies:
- dependency-name: json
dependency-type: direct:production
...
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