Remove unused argument

Author: mjackson

modules/components/Routes.js

@@ -379,7 +379,7 @@ function checkTransitionFromHooks(matches, transition) {
 function checkTransitionToHooks(matches, transition) {
   var promise = Promise.resolve();
 
-  matches.forEach(function (match, index) {
+  matches.forEach(function (match) {
     promise = promise.then(function () {
       var handler = match.route.props.handler;