Update w3c.json

Update to note that the group is the SocialCG

Author: evanp

w3c.json

@@ -1,8 +1,8 @@
 {
-  "group": 72531,
+  "group": "cg/socialcg",
   "contacts": [
     "plehegar"
   ],
   "policy": "open",
   "repo-type": "rec-track"
-}
+}