Updates the roles of this permission

        :return: Success / Failure
        :rtype: bool

def update_roles(self, roles='view'):
        """ Updates the roles of this permission

        :return: Success / Failure
        :rtype: bool
        """
        if not self.object_id:
            return False

        url = self.build_url(self._endpoints.get('permission').format(
            driveitem_id=self.driveitem_id, id=self.object_id))

        if roles in {'view', 'read'}:
            data = {'roles': ['read']}
        elif roles == {'edit', 'write'}:
            data = {'roles': ['write']}
        else:
            raise ValueError('"{}" is not a valid share_type'.format(roles))

        response = self.con.patch(url, data=data)
        if not response:
            return False

        self.roles = data.get('roles', [])
        return True