Add funds to a savings goal.

def deposit(self, deposit_minor_units: int) -> None:
        """Add funds to a savings goal."""
        endpoint = "/account/{0}/savings-goals/{1}/add-money/{2}".format(
            self._account_uid,
            self.uid,
            uuid4()
        )

        body = {
            "amount": {
                "currency": self.total_saved_currency,
                "minorUnits": deposit_minor_units
            }
        }

        response = put(
            _url(endpoint, self._sandbox),
            headers=self._auth_headers,
            data=json_dumps(body)
        )
        response.raise_for_status()

        self.update()