Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Fred Viole <ovvo.financial.systems@gmail.com>’
  
  Found the following (possibly) invalid URLs:
    URL: https://www.ssrn.com/abstract=3002675
      From: man/NNS.FSD.Rd
            man/NNS.FSD.uni.Rd
            man/NNS.SD.efficient.set.Rd
            inst/doc/NNSvignette_Comparing_Distributions.html
      Status: 429
      Message: Too Many Requests
    URL: https://www.ssrn.com/abstract=3007373
      From: man/LPM.ratio.Rd
            man/NNS.ANOVA.Rd
            man/NNS.CDF.Rd
            inst/doc/NNSvignette_Comparing_Distributions.html
            inst/doc/NNSvignette_Partial_Moments.html
            inst/doc/NNSvignette_Sampling.html
      Status: 429
      Message: Too Many Requests
    URL: https://www.ssrn.com/abstract=3382300
      From: man/NNS.ARMA.Rd
            man/NNS.VAR.Rd
            inst/doc/NNSvignette_Forecasting.html
      Status: 429
      Message: Too Many Requests
    URL: https://www.ssrn.com/abstract=3457377
      From: man/PM.matrix.Rd
            inst/doc/NNSvignette_Partial_Moments.html
      Status: 429
      Message: Too Many Requests
    URL: https://www.ssrn.com/abstract=3621614
      From: man/NNS.MC.Rd
            man/NNS.meboot.Rd
            inst/doc/NNSvignette_Sampling.html
      Status: 429
      Message: Too Many Requests
    URL: https://www.ssrn.com/abstract=3681104
      From: man/dy.d_.Rd
      Status: 429
      Message: Too Many Requests

No changes to worse in reverse depends.