Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Dirk Eddelbuettel <edd@debian.org>’
  
  Found the following (possibly) invalid URLs:
    URL: https://www.amazon.com/gp/product/1461468671/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1461468671&linkCode=as2&tag=rcpp-20&linkId=3P5LNUWOAQ2YMEJ6
      From: README.md
      Status: 500
      Message: Internal Server Error

No changes to worse in reverse depends.