Added https type to Websocket.Server (#11213)

* Added https type to Websocket.Server

Hi,

the current typing misses to pass to the Websocket.Server server option a https Server.

Cheers

meno

* * added a test
* fix the missing typo of http(s)

* improve the test

ws/ws-tests.ts

@@ -2,6 +2,7 @@
 
 import * as WebSocket from 'ws';
 import * as http from'http';
+import * as https from'https';
 
 var WebSocketServer = WebSocket.Server;
 
@@ -54,6 +55,12 @@ var WebSocketServer = WebSocket.Server;
     });
 }
 
+{
+    new WebSocket.Server({ server: https.createServer({}) });
+    new WebSocket.Server({ server: http.createServer() });
+}
+
+
 {
     const verifyClient = function(
       info: {
@@ -73,4 +80,4 @@ var WebSocketServer = WebSocket.Server;
     wsv.on('connection', function connection(ws) {
         console.log(ws.protocol)
     })
-}
+}

ws/ws.d.ts

@@ -8,6 +8,7 @@
 declare module "ws" {
     import * as events from 'events';
     import * as http from 'http';
+    import * as https from 'https';
     import * as net from 'net';
 
     class WebSocket extends events.EventEmitter {
@@ -99,7 +100,7 @@ declare module "ws" {
         export interface IServerOptions {
             host?: string;
             port?: number;
-            server?: http.Server;
+            server?: http.Server | https.Server;
             verifyClient?: VerifyClientCallbackAsync | VerifyClientCallbackSync;
             handleProtocols?: any;
             path?: string;