title: Notifications fail to display in Android Oreo (API 26)
body: <p>I get this message when trying to display a notification on Android O.</p>
  
  <blockquote>
    <p>Use of stream types is deprecated for operations other than volume
    control</p>
  </blockquote>
  
  <p>The notification is straight from the example docs, and displays fine on Android 25.</p>