add default param for bootstrap service

Author: sniper00

moon-src/moon.cpp

@@ -219,6 +219,7 @@ int main(int argc, char* argv[])
         conf->name = "bootstrap";
         conf->source = fs::path(bootstrap).filename().string();
         conf->memlimit = std::numeric_limits<size_t>::max();
+        conf->params = "return {}";
         server_->new_service(std::move(conf));
         server_->set_unique_service("bootstrap", BOOTSTRAP_ADDR);