Update README

Fixes #503

Author: mjackson

README.md

@@ -76,7 +76,13 @@ var routes = (
   </Route>
 );
 
-Router.run(routes, function(Handler) {
+Router.run(routes, function (Handler) {
+  React.render(<Handler/>, document.body);
+});
+
+// Or, if you'd like to use the HTML5 history API for cleaner URLs:
+
+Router.run(routes, Router.HistoryLocation, function (Handler) {
   React.render(<Handler/>, document.body);
 });
 ```