upd usage

Author: pakrentos

README.md

@@ -26,5 +26,5 @@ sudo ./install.sh
 SELECT send_<post/put/delete>([<URL or IP with port>] as alias0, data1 as alias1, data2 as alias2, ...) FROM ...;
 ```
 
-Returns 0 per request if request was successfully delivered (but HTTP response code could be 4xx or 5xx)
+Returns response code per request if request was somehow delivered
 NULL if something went wrong;