With RFC6410, there are only two RFC maturity levels, 'Proposed Standard' and 'Internet Standard'. Added a mapping between 'Internet Standard' and slug 'std', to be able to process newer RFC info from the RFC Editor.

 - Legacy-Id: 5477

Author: levkowetz

ietf/sync/rfceditor.py

@@ -276,6 +276,7 @@ def getDocList(parentNode, tagName):
 def update_docs_from_rfc_index(data, skip_older_than_date=None):
     std_level_mapping = {
         "Standard": StdLevelName.objects.get(slug="std"),
+        "Internet Standard": StdLevelName.objects.get(slug="std"),
         "Draft Standard": StdLevelName.objects.get(slug="ds"),
         "Proposed Standard": StdLevelName.objects.get(slug="ps"),
         "Informational": StdLevelName.objects.get(slug="inf"),