docs: public void unblockContacts(List<Jid> jids)
              throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          UnblockContactsIQ unblockContactIQ = new UnblockContactsIQ(jids);
          connection().createStanzaCollectorAndSend(unblockContactIQ).nextResultOrThrow();
      }