Feature:
For finer control over bot's polling and web-hook, the
following methods have been added:
* TelegramBot#isPolling()
* TelegramBot#openWebHook()
* TelegramBot#closeWebHook()
* TelegramBot#hasOpenWebHook()
Please read README.md for more information on the
new methods.
For writable streams, like `http.ClientRequest`, there is no `end` event, only `finish`. Thus, `req.end` was never called and never sending a response.
This resulted in a nasty bug for WebHook users that basically rendered the library useless because if Telegram doesn't receive a response from the bot server, it will continue to queue and send requests until it does, or until 24 hours have passed.
