Use 0ms as polling interval value

Hi!

I would like to perform long polling like this:

var bot = new TelegramBot(token, { polling: { timeout: 2000, interval: 0 } });

The problem is that 0 is replaced with default 2000ms inside the module. I can use interval: 1. It solves the issue but doesn’t feel right. Is there any other way to perform long polling?

[yagop]

As said on #41 I don’t know why people want to do 0ms pooling interval, its really annoying for server and client, its just like DDoSing Telegram.

I will set default polling interval by 300ms

[yagop]

Allow 0ms as polling interval. Default timeout 10 seconds.