atom:link in RSS feed should point to self, not atom

[datashaman]

Describe the bug
Somewhat counter-intuitively, the atom:link URL should point to the RSS feed, not the Atom feed.

See http://www.rssboard.org/rss-profile#namespace-elements-atom
and
https://www.feedvalidator.org/docs/warning/MissingAtomSelfLink.html

To Reproduce

Create an RSS feed.

Expected behavior

RSS feed must include an atom:link element with rel="self" attribute which points to the RSS feed.

Actual behavior

RSS atom:link erroneously points to the Atom feed.

Versions (please complete the following information):

• NodeJS: node v10.17.0
• TypeScript: n/a
• npm/yarn: npm 6.13.4
• feed: 2.0.4

[datashaman]

From examining the code, it looks like you can override this by setting options.feed to the URL of your RSS feed. The default strategy of including the Atom link is still incorrect though.

[datashaman]

Although doing that makes the Atom feed invalid, because it now points to the RSS feed as self. Sigh.