A Update event for Bot.
Update
By internal implementation, third-party implementation is unstable.
ForteScarlet
The content object of the event. The type is one of the possible optional fields in Update, such as Message (Update.message).
Name of the event. Is the name of the field corresponding to the event, such as edited_message.
edited_message
The raw JSON string used to parse out update. If update is externally provided and raw is not provided, it may get null
null
The source Update instance.