fixed post sorting for chrome and opera

src/App.js

@@ -35,7 +35,7 @@ const App = () => {
 
     const recursiveSort = (posts) => {
         posts.forEach((post, index) => {posts[index].comments = recursiveSort(post.comments)});
-        posts.sort((a, b) => a.date < b.date);
+        posts.sort((a, b) => a.date < b.date ? 1 : -1);
         return posts;
     }