docs: def update_wallet(self, wallet_name, limit):
          """Update a wallet with a new limit.
  
          @param the name of the wallet.
          @param the new value of the limit.
          @return a success string from the plans server.
          @raise ServerError via make_request.
          """
          request = {
              'update': {
                  'limit': str(limit),
              }
          }
          return make_request(
              '{}wallet/{}'.format(self.url, wallet_name),
              method='PATCH',
              body=request,
              timeout=self.timeout,
              client=self._client)