Issues parsing React Fragment short syntax

[swissspidy]

Originally reported at wp-cli/i18n-command#280, Peast fails to parse the following JSX using the <>/</> shorthand syntax for React fragments:

import React from 'react';

export default class Example extends React.Component {
  render() {
    return (
        <div className="example">
          <>
          </>
        </div>
    );
  }
}

Errror:

Peast\Syntax\Exception: Unexpected: >

Fragments are being parsed fine if they're on the outmost side though:

export default class Example extends React.Component {
  render() {
    return (
      <>
        <div className="example">
        </div>
      </>
    );
  }
}

[mck89]

I'm not a React expert so i had to find some documentation when writing the JSX parser and that documentation didn't allow fragments inside elements. I tried that syntax and it works with React so i've implemented it, now it works as expected.