readme.md - managingEditor/author/webMaster should be email addresses

https://validator.w3.org/feed/docs/rss2.html specifies

managingEditor - Email address for person responsible for editorial content.
webMaster - Email address for person responsible for technical issues relating to channel.
author - Email address of the author of the item. ( https://validator.w3.org/feed/docs/rss2.html#ltauthorgtSubelementOfLtitemgt )

A list of valid formats for email addresses is included here https://validator.w3.org/feed/docs/error/InvalidContact.html

Therefore I'd say the examples should be changed, as well as the documentation of the fields so as to specify that you should enter an email address.

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I learned this by using the w3org rss feed validator https://validator.w3.org/feed

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Ah, this is also a more general version of https://github.com/dylang/node-rss/issues/30