[minor] Add ability to specify the readableObjectMode option (#1647)

Fixes #1640

Author: tadeuszwojcik

lib/stream.js

@@ -67,7 +67,6 @@ function createWebSocketStream(ws, options) {
     autoDestroy: false,
     emitClose: false,
     objectMode: false,
-    readableObjectMode: false,
     writableObjectMode: false
   });