Update Plexmediaserver on Raspberry Pi 3

@batesnd and the rest of the gang, I just pushed a new package revision to my repo with a fixed migration script. This package also makes it very easy to recover from your current problems.

  1. Install the new package with apt-get
  2. move the old settings back in place: sudo mv /etc/default/plexmediaserver.prev /etc/default/plexmediaserver
  3. call the migration script by hand: sudo /usr/lib/plexmediaserver/MigratePlexServerConfig.sh
  4. reload systemd and start plex: sudo systemctl daemon-reload, sudo systemctl stop plexmediaserver, sudo systemctl start plexmediaserver