Incorrect peer dependencies - support React 17

[CWSites]

I'm using the latest version of react-json-view and getting the following peer dependency warnings. I noticed in #330 that support was added however it seems like that may have been reverted?

warning "@react-theming/storybook-addon > @usulpro/[email protected]" has incorrect peer dependency "react@^16.0.0 || ^15.5.4".
warning "@react-theming/storybook-addon > @usulpro/[email protected]" has incorrect peer dependency "react-dom@^16.0.0 || ^15.5.4".

I realize that this is also a fork of your repo so I'm not certain if the issue is in yours or the fork.