Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Yuta Koike <kyuta@ms.u-tokyo.ac.jp>’
  
  New maintainer:
    Yuta Koike <kyuta@ms.u-tokyo.ac.jp>
  Old maintainer(s):
    Stefano M. Iacus <siacus@iq.harvard.edu>
  
  Found the following (possibly) invalid URLs:
    URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/treering/measurements/northamerica/usa/ca535.rwl
      From: man/MWK151.Rd
      Status: Error
      Message: Could not resolve hostname [ftp.ncdc.noaa.gov]:
        Could not resolve host: ftp.ncdc.noaa.gov

No changes to worse in reverse depends.