title: Is it possible to send push notification with message icon from the server side to android device via PyFCM
body: <p>I want to send push notification to android application with icon from the server side.
  Is it possible or did i get it wrong?
  <a href="https://i.stack.imgur.com/aeOff.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aeOff.png" alt="enter image description here"></a>
  If it's possible, then which image format are expected as an input for PyFCM method notify_single_device for parameter message_icon. Didn't get the answer from the <a href="https://github.com/olucurious/PyFCM/blob/master/pyfcm/baseapi.py" rel="nofollow noreferrer">source code in github</a>.</p>
  
  <p>It's just referred as an variable.
  Base64 doesn't go through.</p>