Add ability to display revisions

js/components/ItemRevision.js

@@ -0,0 +1,14 @@
+import React from 'react';
+import Badge from './Badge';
+import { formatRelease } from '../date';
+
+export default function ItemRevision({ revision }) {
+  return (
+    <div className="item-revision">
+      <div>
+        <Badge type={revision.ring}>{revision.ring} | {formatRelease(revision.release)}</Badge>
+      </div>
+      <div className="markdown" dangerouslySetInnerHTML={{__html: revision.body}} />
+    </div>
+  );
+}