Demo link form NPM readme not available

[Viiprogrammer]

Real: https://nodeca.github.com/js-yaml/ (404 There isn't a GitHub Pages site here.)
Expected: https://nodeca.github.io/js-yaml/

[rahulmathews]

It seems like the one in npm is not updated to the latest one from github readme.

[jayvdb]

Ya this was fixed in #618 , but a release hasnt been done in 4 years.
c.f. #728