def update(self, friendly_name=values.unset,<EOL>assignment_callback_url=values.unset,<EOL>fallback_assignment_callback_url=values.unset,<EOL>configuration=values.unset, task_reservation_timeout=values.unset):
return self._proxy.update(<EOL>friendly_name=friendly_name,<EOL>assignment_callback_url=assignment_callback_url,<EOL>fallback_assignment_callback_url=fallback_assignment_callback_url,<EOL>configuration=configuration,<EOL>task_reservation_timeout=task_reservation_timeout,<EOL>)<EOL>
Update the WorkflowInstance

:param unicode friendly_name: A string representing a human readable name for this Workflow.
:param unicode assignment_callback_url: A valid URL for the application that will process task assignment events.
:param unicode fallback_assignment_callback_url: If the request to the AssignmentCallbackUrl fails, the assignment callback will be made to this URL.
:param unicode configuration: JSON document configuring the rules for this Workflow.
:param unicode task_reservation_timeout: An integer value controlling how long in seconds TaskRouter will wait for a confirmation response from your application after assigning a Task to a worker.

:returns: Updated WorkflowInstance
:rtype: twilio.rest.taskrouter.v1.workspace.workflow.WorkflowInstance