Get a list of final destinations for a stop.

async def get_final_destination(self):
        """Get a list of final destinations for a stop."""
        dest = []
        await self.get_departures()
        for departure in self._departures:
            dep = {}
            dep['line'] = departure.get('line')
            dep['destination'] = departure.get('destination')
            dest.append(dep)
        return [dict(t) for t in {tuple(d.items()) for d in dest}]