Support API 6.8 and 6.9

[ex0ns]

Bot API 6.9

• Added the new administrator privileges can_post_stories, can_edit_stories and can_delete_stories to the classes ChatMemberAdministrator and ChatAdministratorRights.
• Added the parameters can_post_stories, can_edit_stories and can_delete_stories to the method promoteChatMember. Currently, bots have no use for these privileges besides assigning them to other administrators.
• Added the fields from_request and from_attachment_menu to the class WriteAccessAllowed.

Bot API 6.8

• Added the field story to the class Message for messages with forwarded stories. Currently, it holds no information.
• Added the field emoji_status_expiration_date to the class Chat.
• Added the method unpinAllGeneralForumTopicMessages.

Notes: polls are missing from this bot, I will add them in the future, they were added a long time ago in 4.6 https://core.telegram.org/bots/api-changelog#january-23-2020