The package golang-github-hashicorp-go-retryablehttp 0.0~git20160810.0.f4ed9b0-1 has been added to kali-rolling. It has been imported from Debian: https://tracker.debian.org/pkg/golang-github-hashicorp-go-retryablehttp -- More information about golang-github-hashicorp-go-retryablehttp: http://pkg.kali.org/pkg/golang-github-hashicorp-go-retryablehttp