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

:param unicode body: The text of the message you want to send

:returns: Updated MessageInstance
:rtype: twilio.rest.api.v2010.account.message.MessageInstance