library's url
I get a remote library from an url, like this:
Library.getRemoteLibraryWithRSS(
  url,
  (err, library) => {
  }
)
How can I get the url from the library?
I try this: library.getDocument().path. 
I got "https://developer.apple.com/design/downloads/sketch.rss". But I want to get the url where the rss.xml exits.