Update PrometheusService.java

main/src/main/java/com/ongres/pgio/main/PrometheusService.java

@@ -38,7 +38,7 @@ public class PrometheusService extends NanoHTTPD {
   private final AtomicReference<Optional<StatSnapshot>> previousStatsReference = 
       new AtomicReference<Optional<StatSnapshot>>(Optional.empty());
   
-  public PrometheusService(Config config) {
+  public PrometheusService(Config config) throws IOException {
     super(config.getPrometheusBind().getHostName(),
         config.getPrometheusPort());
     start(NanoHTTPD.SOCKET_READ_TIMEOUT, false);