Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Martin Elff <memisc@elff.eu>’
  
  Found the following (possibly) invalid URLs:
    URL: https://electionstudies.org
      From: inst/doc/anes48.html
      Status: 403
      Message: Forbidden
    URL: https://electionstudies.org/studypages/1948prepost/1948prepost.htm
      From: inst/doc/anes48.html
      Status: 403
      Message: Forbidden

No changes to worse in reverse depends.