0.8.7:

  * Don't show the "device disconnected" notification, it can be annoying and
    not very useful.
  * More robust detection of systray icon visibility.

0.8.6:

  * Ensure the Gtk application is single-instance.
  * Fix identifying available dpi values.
  * Fixed locating application icons when installed in a custom prefix.
  * Fixed some icon names for the oxygen theme.
  * Python 3 fixes.