Add HISTORY entry for Router hasRoute() change

src/app/HISTORY.md

@@ -4,20 +4,35 @@ App Framework Change History
 @VERSION@
 ------
 
-* No changes.
+### Router
+
+* Fixed issue where Router's `hasRoute(url)` method did not follow the same
+  semantics as the route dispatching process. Now all registered param handlers
+  will process any named params, giving them a chance to validate and reject a
+  param value. This will make the `hasRoute()` method an effective way to check
+  whether a router will dispatch to a route handler for a given URL. ([#][])
+
+
+[#1722]: https://github.com/yui/yui3/issues/1722
+
 
 3.15.0
 ------
 
+### Model
+
 * __[!]__ Refactored `ModelSync.Local` to use a different, more readable
   storage system. This new storage system is backwards-incompatible with
   the old storage system. However, the API remains the same and no application
   code needs to be changed unless you want to maintain the data that is
   present in `localStorage` today. ([#1597][])
 
-* Fixed an issue where `history-hash-ie` loaded on non-IE browsers. ([#1613][]: @ezequiel)
+* Fixed an issue where `history-hash-ie` loaded on non-IE browsers.
+  ([#1613][]: @ezequiel)
+
+
+[#1613]: https://github.com/yui/yui3/issues/1613
 
-[#1613]: https://github.com/yui/yui3/pull/1613
 
 3.14.1
 ------