Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Teppei Yamamoto <tyamam@waseda.jp>’
  
  New maintainer:
    Teppei Yamamoto <tyamam@waseda.jp>
  Old maintainer(s):
    Teppei Yamamoto <teppei@mit.edu>

No changes to worse in reverse depends.