Update README.md

slapos/software/opcua-to-http-gw/README.md

@@ -9,6 +9,7 @@ partition_parameter_kw = {
   "erp5-username": "<USERNAME>",
   "erp5-password": "<PASSWORD>",
   "opcua-port": <PORT>
+  "opcua-xml-url": "<opcua-server-config.xml>"
 }
 filter_kw = { "computer_guid": "COMP-****" }
 request(software_release=release, partition_reference="****", partition_parameter_kw=partition_parameter_kw, filter_kw=filter_kw)