Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Luong Bang Tran <lutran@iom.int>’
  
  Found the following (possibly) invalid URLs:
    URL: https://cran.r-project.org/web/packages/dtmapi/index.html
      From: README.md
      Status: 200
      Message: OK
      CRAN URL not in canonical form
  The canonical URL of the CRAN page for a package is 
    https://CRAN.R-project.org/package=pkgname