public function __construct($token)
{
$this->token = $token;
if (is_null($this->token)) {
throw new TelegramException('Required "token" key not supplied');
}
$this->baseURL = self::BASE_URL . self::BOT_URL . $this->token . '/';
$this->baseFileURL = self::BASE_URL . self::FILE_URL . self::BOT_URL . $this->token . '/';
}