The package golang-github-spf13-viper 1.0.0+git20171109.4dddf7c-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-spf13-viper -- More information about golang-github-spf13-viper: http://pkg.kali.org/pkg/golang-github-spf13-viper
