React and React-Dom should be added to dev and peer dependencies

[hjrdave]

I am using this library as a dependency for a private npm package I am developing. I noticed I was having an issue developing my package locally because a dependency kept installing React when I did an npm install. This caused conflicts between my developer environment and local package. A symlink is usually used for both local projects to prevent this conflict. Upon further research I discovered 'react-spinners-kit' has react and react-dom in the dependencies which is causing it to automatically install. I believe best practice is to have it in peer dependencies and not dependencies.