PropTypes no longer supported

[ARMATAV]

Hey, minor error at CircularProgress.js:66 onward.

Warning: PropTypes has been moved to a separate package. Accessing React.PropTypes is no longer supported and will be removed completely in React 16. Use the prop-types package on npm instead. (https://fb.me/migrating-from-react-proptypes)

[markusl]

This is now fixed in the npm package.