title: Sweet alert 2 multiple checkbox
body: <p>I'm using this "sweet alert 2", I I need of multiple checkbox,
  In documentation there is 'input-radio' option with multiple choice, but only single choice for checkbox option.</p>
  
  <p>Is there possibily to use this script with checkbox multiple choice? </p>
  
  <pre><code>swal({
    title: 'Select color',
    input: 'radio',
    inputOptions: {
      '#ff0000': 'Red',
      '#00ff00': 'Green',
      '#0000ff': 'Blue'
    }
  })
  </code></pre>
  
  <p>thanks</p>