Add titles to items in jsonfeed

format.ts

@@ -248,6 +248,7 @@ export function timelineAsJSON(username: string, tweets: Tweet[]): string {
     const html = joinChildren(children);
     return {
       id: tweet.id_str,
+      title: tweet.full_text.split('\n')[0],
       url: buildTwitterUrl(`/${tweet.user.screen_name}/status/${tweet.id_str}`),
       content_html: html,
       date_published: new Date(tweet.created_at).toISOString(),