Represent an update
This object represents an incoming Update.
Update(data) is.Update(x)
| data | Data of the update. | 
| x | Object to be tested. | 
An R6Class object.
from_chat_idTo get the id from the update's
effective chat.
from_user_idTo get the id from the update's
effective user.
effective_chatTo get the chat that this update was sent in, no matter what kind of update this is.
effective_userTo get the user that sent this update, no matter what kind of update this is.
effective_messageTo get the message included in this update, no matter what kind of update this is.
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