Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Kisung You <kisung.you@outlook.com>’
  
  New maintainer:
    Kisung You <kisung.you@outlook.com>
  Old maintainer(s):
    Kisung You <kisungyou@outlook.com>
  
  Found the following (possibly) invalid URLs:
    URL: https://people.cs.uchicago.edu/~dinoj/manifold/swissroll.html
      From: README.md
      Status: Error
      Message: SSL peer certificate or SSH remote key was not OK [people.cs.uchicago.edu]:
        server verification failed: certificate has expired. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)

No changes to worse in reverse depends.