message: Typo in unknown command error message
diff: @@ -44,7 +44,7 @@ std::shared_ptr<Cmd> PikaClientConn::DoCmd(
  if (!c_ptr) {
  std::shared_ptr<Cmd> tmp_ptr = std::make_shared<DummyCmd>(DummyCmd());
  tmp_ptr->res().SetRes(CmdRes::kErrOther,
  - "unknown or unsupported command \'" + opt + "\"");
  + "unknown or unsupported command \"" + opt + "\"");
  return tmp_ptr;
  }
  c_ptr->SetConn(std::dynamic_pointer_cast<PikaClientConn>(shared_from_this()));
  