Changes in version 0.7                         

    o   proxy setup using in TGBot call or using set_proxy method (both takes
	 a list of parameters passed to httr::use_proxy

    o   `group_id` utility function (it work the same as `bot_token` or
	`user_id`, by using the `R_TELEGRAM_GROUP_` prefix);

    o   `sendDice` method;

    o   `sendPoll` method;

    o   `sendChatAction` method;

    o   miscellaneous bugfixes.