Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Jiaming Yuan <jm.yuan@outlook.com>’
  
  Found the following (possibly) invalid URLs:
    URL: https://stackoverflow.com/questions/21435339/data-table-vs-dplyr-can-one-do-something-well-the-other-cant-or-does-poorly
      From: inst/doc/discoverYourData.html
      Status: 403
      Message: Forbidden

No changes to worse in reverse depends.