ReactLink still using React.PropTypes.

[damiannlee]

Do you want to request a feature or report a bug?
BUG

What is the current behavior?
React.PropTypes는 React에서 더이상 사용되지 않을 것임에도 불구하고 사용되고 있습니다.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/84v837e9/).
https://github.com/facebook/react/blob/15-stable/src/addons/link/ReactLink.js#L62

What is the expected behavior?
PropTypes를 prop-types 패키지로부터 가져와서 사용하는게 좋을 것 같습니다.

Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?
15.5.4