'Update the ActivityInstance
:param unicode friendly_name: The friendly_name
:returns: Updated ActivityInstance
:rtype: twilio.rest.taskrouter.v1.workspace.activity.ActivityInstance'

def update(self, friendly_name=values.unset):

    data = values.of({'FriendlyName': friendly_name})
    payload = self._version.update('POST', self._uri, data=data)
    return ActivityInstance(self._version, payload, workspace_sid=self._solution['workspace_sid'], sid=self._solution['sid'])
