The package golang-github-mitchellh-mapstructure 0.0~git20170523.0.d0303fe-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-mitchellh-mapstructure -- More information about golang-github-mitchellh-mapstructure: http://pkg.kali.org/pkg/golang-github-mitchellh-mapstructure