Update display of combined referrer urls.

lib/url.js

@@ -2,6 +2,10 @@ export function removeTrailingSlash(url) {
   return url && url.length > 1 && url.endsWith('/') ? url.slice(0, -1) : url;
 }
 
+export function removeWWW(url) {
+  return url && url.length > 1 && url.startsWith('www.') ? url.slice(4) : url;
+}
+
 export function getDomainName(str) {
   try {
     return new URL(str).hostname;