added migrations for instant delivery

node_modules/react-router/lib/isReactChildren.js

@@ -0,0 +1,13 @@
+'use strict';
+
+var React = require('react');
+
+function isValidChild(object) {
+  return object == null || React.isValidElement(object);
+}
+
+function isReactChildren(object) {
+  return isValidChild(object) || Array.isArray(object) && object.every(isValidChild);
+}
+
+module.exports = isReactChildren;