Merge pull request #191 from t49tran/doc-remove-non-exist-debug-option

doc: remove non exist debug option

README.md

@@ -149,7 +149,6 @@ app.get('/', (req, res, next) => res.send('Hello world!'));
 const server = app.listen(9000);
 
 const peerServer = ExpressPeerServer(server, {
-  debug: true,
   path: '/myapp'
 });