added a link to the official version on the wiki

README.md

@@ -6,6 +6,8 @@ This is the working area for the SACM working group internet-draft, "SACM Vulner
 * [Individual Draft] (https://tools.ietf.org/html/draft-ietf-sacm-vuln-scenario)
 * [Compare Working Group and Editor's Drafts] (https://tools.ietf.org/rfcdiff?url1=https://www.ietf.org/id/draft-ietf-sacm-vuln-scenario&url2=https://sacmwg.github.io/vulnerability-scenario/draft-ietf-sacm-vuln-scenario.txt)
 
+The official copy of this document is now posted on the SACM WG wiki page (https://trac.ietf.org/trac/sacm/wiki/SacmVulnerabilityAssessmentScenario). There are no plans to publish subsequent Internet-Drafts for this document and all updates will be made to the wiki page.
+
 ## Status
 
 The document has been adopted as a working group document and is under active developement.