Added sendStatus() to express.Response

Added as described in documentation: http://expressjs.com/4x/api.html#res.sendStatus

express/express.d.ts

@@ -424,7 +424,22 @@ declare module "express" {
              * @param code
              */
             status(code: number): Response;
-
+            
+            /**
+             * Set the response HTTP status code to `statusCode` and send its string representation as the response body.
+             * @link http://expressjs.com/4x/api.html#res.sendStatus
+             * 
+             * Examples:
+             * 
+             *    res.sendStatus(200); // equivalent to res.status(200).send('OK')
+             *    res.sendStatus(403); // equivalent to res.status(403).send('Forbidden')
+             *    res.sendStatus(404); // equivalent to res.status(404).send('Not Found')
+             *    res.sendStatus(500); // equivalent to res.status(500).send('Internal Server Error')
+             * 
+             * @param code
+             */
+            sendStatus(code: number): Send;
+            
             /**
              * Set Link header field with the given `links`.
              *