Update feed.json.php

altered the url in the template for the feed.

Author: luxuryluke

site/templates/feed.json.php

@@ -6,6 +6,6 @@
     'version' => 'https://jsonfeed.org/version/1.1',
     'title' => $site->title()->value(),
     'home_page_url' => $site->url(),
-    'feed_url' => $site->url() . '/feed.json',
+    'feed_url' => $site->url() . '/feed',
     'items' => $items,
 ], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);