The package golang-github-xdg-go-stringprep 1.0.4-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-xdg-go-stringprep -- More information about golang-github-xdg-go-stringprep: http://pkg.kali.org/pkg/golang-github-xdg-go-stringprep