title: Fluent UI PeoplePicker onChange
body: <p>I am trying to use the PeoplePicker control on Fluent UI:</p>
  <p><a href="https://developer.microsoft.com/en-us/fluentui#/controls/web/peoplepicker" rel="nofollow noreferrer">https://developer.microsoft.com/en-us/fluentui#/controls/web/peoplepicker</a></p>
  <p>How can I trigger an action when a selection is made? I don't see any onChange method or similar exposed in the API.</p>