handle_update: handle_update
Description
This method is called if it was determined that an update should indeed
be handled by this instance. It should also be overridden (see Handler).
Usage
handle_update(update, dispatcher)
Arguments
update
The update to be handled.
dispatcher
The dispatcher to collect optional arguments.
Details
In most cases self$callback(dispatcher$bot, update) can be called,
possibly along with optional arguments.