Component uses React.PropTypes which is deprecated

[Freywar]

PropTypes have moved to separate package and won't be accessible as React field in next version: https://facebook.github.io/react/blog/2017/04/07/react-v15.5.0.html

[martinmacko47]

There is already a PR #8 for it. @qimingweng please merge it and release

[gr8pathik]

Here is the upgraded version of the react-spinjs which is compatible with the latest react version. Feel free to use this package.
https://github.com/gr8pathik/react-spinjs

I have also added the new npm package
https://www.npmjs.com/package/react-spinjs-new