docs: public void changeSubject(String subject)
              throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          MUCLightSetConfigsIQ mucLightSetConfigIQ = new MUCLightSetConfigsIQ(room, null, subject, null);
          connection.createStanzaCollectorAndSend(mucLightSetConfigIQ).nextResultOrThrow();
      }