Stateless switch with too long delay()
Hi,
first of all, thank you for this plugin, it's perfect!

I have a stateless switch with delay(13000) between two URLs.
```
"onUrl": [
  "http://localhost/api/switch1On",
  "delay(13000)",
  "http://localhost/api/switch2On"
]
```
The problem is, that the delay is too long. When I ask Siri to turn the switch on, she replies "Sorry, I couldn't hear back from your devices". 
Is there a way you could add a typical "timeout : 1000" response, the same way it works with single URL switches? So before it executes rest of the onUrl, it already replies to Homebridge.

Thank you.
Best regards and Merry Christmas.
Lukas