Describe the bug
According to https://www.netlifycms.org/blog/2019/07/netlify-cms-gatsby-plugin-4-0-0/ instead of netlify-cms we need to use netlify-cms-app package as it has React as a peer dependency. But netlify-cms-app also has netlify-cms-core dependency https://github.com/netlify/netlify-cms/blob/master/packages/netlify-cms-app/package.json#L33 which has React as a dependency, not a peer one https://github.com/netlify/netlify-cms/blob/master/packages/netlify-cms-core/package.json#L39
Because of that I still have multiple instances of React.

Expected behavior
In the package.json of netlify-cms-core react is set as a peer dependency

Screenshots