Editorial: Update the Version History link URL (#23)

Author: sideshowbarker

index.bs

@@ -13,7 +13,7 @@ Abstract:
   fetching them.
 Indent: 2
 Level: None
-Version History: https://github.com/w3c/webappsec-upgrade-insecure-requests/commits/master/index.src.html
+Version History: https://github.com/w3c/webappsec-upgrade-insecure-requests/commits/main/index.bs
 Boilerplate: omit conformance, omit feedback-header
 !Participate: File an issue (open issues)