Added Windows support

tty/Terminal_windows.go

@@ -1,6 +1,10 @@
 package tty
 
+import "golang.org/x/sys/windows"
+
 // IsTerminal returns true if the file descriptor is a terminal.
 func IsTerminal(fd uintptr) bool {
-	return false
+	var mode uint32
+	err := windows.GetConsoleMode(windows.Handle(fd), &mode)
+	return err == nil
 }