Conforming to discovery spec

[M4tthewDE]

According to the spec the protocol supports the following three discovery mechanisms:

• Link Headers
• Link Elements (HTML) (Subscriber html tag discovery #2)
• Link Elements (XML)

As of now, only link headers and HTML link elements are supported.

[NotNotQuinn]

Atom feeds and RSS feeds were lightly mention under Content Distribution, and are listed as tests 102 and 103 under the websub.rocks subscriber tests.

For Atom ([RFC4287]) and RSS ([RSS-2.0]) feeds, the hub MAY remove already-delivered atom:entry or rss:item elements from the feed.

This lead me to believe that they were part of the spec, but are not.

So, disregard the readme.

[M4tthewDE]

👍