code: func (d *Dock) SetBadge(badge string) (err error) {
  	if err = d.isActionable(); err != nil {
  		return
  	}
  	_, err = synchronousEvent(d.c, d, d.w, Event{Name: eventNameDockCmdSetBadge, TargetID: d.id, Badge: badge}, eventNameDockEventBadgeSet)
  	return
  }
docs: // SetBadge sets the badge of the dock