Update Version History URL to "main" branch (#149)

Author: sideshowbarker

index.src.html

@@ -10,7 +10,7 @@ <h1>Referrer Policy</h1>
 Editor: Emily Stark 76989, Google Inc., [email protected]
 Group: webappsec
 Abstract: This document describes how an author can set a referrer policy for documents they create, and the impact of such a policy on the <code>Referer</code> HTTP header for outgoing requests and navigations.
-Version History: https://github.com/w3c/webappsec-referrer-policy/commits/master/index.src.html
+Version History: https://github.com/w3c/webappsec-referrer-policy/commits/main/index.src.html
 Indent: 2
 Ignored Vars: requestURL
 Repository: w3c/webappsec-referrer-policy