def update(self, unique_name=values.unset, friendly_name=values.unset):
data = values.of({'<STR_LIT>': unique_name, '<STR_LIT>': friendly_name, })<EOL>payload = self._version.update(<EOL>'<STR_LIT:POST>',<EOL>self._uri,<EOL>data=data,<EOL>)<EOL>return RatePlanInstance(self._version, payload, sid=self._solution['<STR_LIT>'], )<EOL>
Update the RatePlanInstance

:param unicode unique_name: A user-provided string that uniquely identifies this resource as an alternative to the Sid.
:param unicode friendly_name: A user-provided string that identifies this resource.

:returns: Updated RatePlanInstance
:rtype: twilio.rest.wireless.v1.rate_plan.RatePlanInstance