Update w3c.json

@plehegar leads the Strategy team

Author: plehegar

w3c.json

@@ -1,6 +1,6 @@
  {
     "group":      94247
-,   "contacts":   ["wseltzer"]
+,   "contacts":   ["plehegar"]
 ,   "policy":     "open"
 ,   "repo-type":  "project"
 }