Determine whether a terminal supports color.
go get gopkg.ilharper.com/x/supcolor
import "gopkg.ilharper.com/x/supcolor"
// Variables (int8)
// https://github.com/chalk/supports-color#api
supcolor.Stdout // supcolor.SupColor(os.Stdout)
supcolor.Stderr // supcolor.SupColor(os.Stderr)