Update PrometheusService.java

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

@@ -26,9 +26,9 @@ import com.ongres.pgio.main.stats.serializer.StatSerializer;
 import fi.iki.elonen.NanoHTTPD;
 import fi.iki.elonen.NanoHTTPD.Response.Status;
 
-import java.io.IOException;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.PrintStream;
 import java.util.Optional;
 import java.util.concurrent.Callable;