provide vendor dir for nix

vendor/github.com/sirupsen/logrus/terminal_check_windows.go

@@ -0,0 +1,27 @@
+// +build !appengine,!js,windows
+
+package logrus
+
+import (
+	"io"
+	"os"
+
+	"golang.org/x/sys/windows"
+)
+
+func checkIfTerminal(w io.Writer) bool {
+	switch v := w.(type) {
+	case *os.File:
+		handle := windows.Handle(v.Fd())
+		var mode uint32
+		if err := windows.GetConsoleMode(handle, &mode); err != nil {
+			return false
+		}
+		mode |= windows.ENABLE_VIRTUAL_TERMINAL_PROCESSING
+		if err := windows.SetConsoleMode(handle, mode); err != nil {
+			return false
+		}
+		return true
+	}
+	return false
+}