Delete a wallet.

        @param the name of the wallet.
        @return a success string from the plans server.
        @raise ServerError via make_request.

def delete_wallet(self, wallet_name):
        """Delete a wallet.

        @param the name of the wallet.
        @return a success string from the plans server.
        @raise ServerError via make_request.
        """
        return make_request(
            '{}wallet/{}'.format(self.url, wallet_name),
            method='DELETE',
            timeout=self.timeout,
            client=self._client)