react/prop-types doesn't work with fragment syntax

**Example:**

```javascript
import React from "react";

const ForAttendees = ({ page }) => (
  <>
    <section className="intro intro_attendees">{page}</section>
    <div className="grid--5col">barfoo</div>
  </>
);

export default ForAttendees;
```

`react/prop-types` does **not** capture this. If you replace the fragment syntax with divs, it detects the case.