Use vendoring for backward compatibility The switch of the Madon library to Go modules breaks builds with Go version < 1.11 since the import path now contains "v2". This patch adds vendoring so that it can still build with those versions. Let's try to re-enable Travis builds with Go v1.8-1.11...

// +build !windows
// +build !appengine

package isatty

// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
// terminal. This is also always false on this environment.
func IsCygwinTerminal(fd uintptr) bool {
	return false
}