Package check result: NOTE

Check: CRAN incoming feasibility, Result: NOTE
  Maintainer: ‘Sebastian Kreutzer <maintainer_luminescence@r-luminescence.org>’
  
  Found the following (possibly) invalid URLs:
    URL: https://gepris.dfg.de/gepris/projekt/250974974
      From: README.md
      Status: Error
      Message: server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)
    URL: https://gepris.dfg.de/gepris/projekt/46526743
      From: README.md
      Status: Error
      Message: server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)
    URL: https://gepris.dfg.de/gepris/projekt/505822867
      From: README.md
      Status: Error
      Message: server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)
    URL: https://gepris.dfg.de/gepris/projekt/528704761?language=en
      From: README.md
      Status: Error
      Message: server verification failed: certificate signer not trusted. (CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none)

No changes to worse in reverse depends.