Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Ben Goodrich <benjamin.goodrich@columbia.edu>’
  
  Found the following (possibly) invalid URLs:
    URL: https://sites.stat.columbia.edu/gelman/
      From: DESCRIPTION
      Status: Error
      Message: SSL peer certificate or SSH remote key was not OK [sites.stat.columbia.edu]:
        server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)

No changes to worse in reverse depends.