eslint-plugin-react: False Positive: "react/prop-types [PROP_NAME] is missing in props validation" when using stateless components + destructured param + Flow

Similar to #467, I found a minor bug with stateless components with flow annotations.

/Users/adc/Developer/ayrton/react-key-handler/demo/components/demos/input-element.js
  9:16  error  'keyName' is missing in props validation  react/prop-types

/* @flow */

import React from 'react';

type Props = {
  keyName: ?string,
};

function Demo({keyName}: Props): React$Element {
  return (
    <div>
      {keyName}
    </div>
  );
}

This is caused because of destructuring, when I don’t destructure the props all is fine:

function Demo(props: Props): React$Element {
  return (
    <div>
      {props.keyName}
    </div>
  );
}