specified the currently supported auth method (#5)

* Update doc/03-Configuration.md

Co-authored-by: Tobias Bauriedel <tobias@bauriedel.de>

---------

Co-authored-by: Markus Opolka <markus.opolka@netways.de>
Co-authored-by: Tobias Bauriedel <tobias@bauriedel.de>

Author: 3 people

doc/03-Configuration.md

@@ -16,7 +16,7 @@ An official list of available tables can be found [here](https://www.servicenow.
 Since we wanted to make it as customizable as possible, we don't have a hard-coded API method. Therefore, you have to provide the full endpoint for the table here (e.g. `api/now/table/cmdb_ci_server`).
 
 **ServiceNow API Username:** User to authenticate against the ServiceNow API.
-
+Currently only Basic Auth is supported to authenticate against ServiceNow.
 This user needs to have read access to the table you want to import.
 
 **ServiceNow API Password:** Password to authenticate against the ServiceNow API.