title: How to implement auto-update in a Greasemonkey script?
body: <p>I am writing a Greasemonkey script, how to implement auto updating?</p>
  
  <p>Is possible put script into GitHub repository and set <code>@version</code> number?</p>
  
  <p>And then... is some automatically way how to do it? Or I must manually check.</p>