README.adoc in relaton-ietf-1.9.6 vs README.adoc in relaton-ietf-1.9.7

- old
+ new
@@ -147,19 +147,9 @@
 
 - `source` - dataset name (`ietf-rfcsubseries` or `ietf-internet-drafts`)
 - `output` - folder to save documents (default './data').
 - `format` - format in which the documents are saved. Possimle formats are: `yaml`, `xml`, `bibxml` (default `yaml`).
 
-For `ietf-rfcsubseries` dataset only special XML format is supported:
-
-[sourse.xml]
-----
-<referencegroup anchor="BCP14" target="https://www.rfc-editor.org/info/bcp14">
-  <xi:include href="https://www.rfc-editor.org/refs/bibxml/reference.RFC.2119.xml" />
-  <xi:include href="https://www.rfc-editor.org/refs/bibxml/reference.RFC.8174.xml" />
-</referencegroup>
-----
-
 [source,ruby]
 ----
 RelatonIetf::DataFetcher.fetch "ietf-internet-drafts"
 Started at: 2021-12-17 10:23:20 +0100
 Stopped at: 2021-12-17 10:29:19 +0100