Reverted back 'ignore' key to string

Author: Rachit Tiwari

lib/tunnel.js

@@ -1157,7 +1157,7 @@ async function getTunnelID(infoAPIPort, retries){
       })
       var subprocess = childProcess.spawn(self.binaryPath, binaryArguments, {
         detached:true,
-        stdio:['ignore','ignore','ignore','ignore']
+        stdio:'ignore'
       });
       subprocess.unref()