'Accessing PropTypes via the main React package is deprecated' warning in React 15.5+

[claire-kz]

Getting console warning: 'Warning: Accessing PropTypes via the main React package is deprecated. Use the prop-types package from npm instead.'

In React 15.5+, there's an external prop-types package. More here: https://facebook.github.io/react/blog/2017/04/07/react-v15.5.0.html#migrating-from-react.proptypes

Warning is being thrown from accessing of PropTypes in index.js on line 32.

[maciekmp]

As you can see this lib do not have any proptypes so it is not from this repo.
https://github.com/kimmobrunfeldt/react-progressbar.js/blob/master/dist/react-progressbar.js