Include GUID in FeedRead.rss

[richardkazuomiller]

I think it would be good if GUID was included in the result of FeedRead.rss() because sometimes multiple articles have the same url, or the URL of an article changes over time (Example: https://status.digitalocean.com/rss). Without this it is difficult to uniquely identify individual articles. Any thoughts on this?

http://www.w3schools.com/rss/rss_tag_guid.asp