Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Ioannis Kosmidis <ioannis.kosmidis@warwick.ac.uk>’
  
  Found the following (possibly) invalid URLs:
    URL: https://www.dirk-schumacher.net
      From: inst/doc/separation.html
      Status: Error
      Message: SSL peer certificate or SSH remote key was not OK [www.dirk-schumacher.net]:
        SSL: certificate subject name (*.github.io) does not match target hostname 'www.dirk-schumacher.net'

No changes to worse in reverse depends.