Feature:
We shall allow passing more options to the HTTP server,
in `https.createServer()`.
We are using a new property, `https`, to avoid any namespace
collisions with our own options.
`options.key`, `options.cert` and `options.pfx` are convenient
options, in that they allow the user to provide paths to the
corresponding files, which are read automatically,
though synchronously!
Implementation:
* completely backwards-compatible
* all changes are being tested, except `options.pfx`
References:
* Pass `ca` prop to https.createServer(): https://github.com/yagop/node-telegram-bot-api/pull/17
Feature:
Instead of guessing of a proper timeout, we shall use the error
response to calculate it. The error provides us with the number
of milliseconds we need to wait before retrying the request.
Feature:
Our tests are PASSING!
NOTE:
-----
Before running tests, provide the environment variable,
TEST_GAME_SHORT_NAME, whose value is the short name of a game
created for the test bot. It is used in testing methods for
games, such as TelegramBot#sendGame().
