updates to pypi publishing section

I don't follow this stuff too much, but OpenID, the spec itself, is being superseded I guess by Oauth2, but, "OpenID", the brand intends to live on with "OpenID Connect" (which is Oauth2 based), and more generally the idea of apps reusing major identites like google, facebook etc.. is not going away.

So, to me, mentioning that PyPI supports OpenID (now, at the moment) is important, because it implies a commitment to the idea of identity reuse,  regardless of the underlying spec at the time.   

Will  PyPI/warehouse continue to support this in some form?  How? We could add a sentence that explains where PyPI is going.