update peerDependency for react v15.0 and react-dom v15.0
update peerDependency for react v15.0 and react-dom v15.0

0.15 isn't a react (or react-dom) version, should this be 15.0?

https://github.com/facebook/react/releases
buildo/react-datepicker,buildo/rc-datepicker,buildo/rc-datepicker,buildo/react-semantic-datepicker