O365 PATCH method.

def patch_resource(self, path, body=None, json=None):
        """
        O365 PATCH method.
        """
        url = '%s%s' % (path, self._param_list())
        headers = {
            'Accept': 'application/json;odata=minimalmetadata'
        }

        if json:
            headers['Content-Type'] = 'application/json'
            body = json_dumps(json)

        response = O365_DAO().patchURL(self._url(url), headers, body)

        if not (response.status == 200 or response.status == 201 or
                response.status == 204):
            raise DataFailureException(url, response.status, response.data)

        return json_loads(response.data) if len(response.data) else {}