Update vendor folder (Delve support)

vendor/github.com/derekparker/delve/pkg/terminal/terminal_windows.go

@@ -0,0 +1,35 @@
+package terminal
+
+import (
+	"io"
+	"os"
+	"strings"
+	"syscall"
+
+	"github.com/mattn/go-colorable"
+)
+
+// getColorableWriter will return a writer that is capable
+// of interpreting ANSI escape codes for terminal colors.
+func getColorableWriter() io.Writer {
+	if strings.ToLower(os.Getenv("ConEmuANSI")) == "on" {
+		// The ConEmu terminal is installed. Use it.
+		return os.Stdout
+	}
+
+	const ENABLE_VIRTUAL_TERMINAL_PROCESSING = 0x0004
+
+	h, err := syscall.GetStdHandle(syscall.STD_OUTPUT_HANDLE)
+	if err != nil {
+		return os.Stdout
+	}
+	var m uint32
+	err = syscall.GetConsoleMode(h, &m)
+	if err != nil {
+		return os.Stdout
+	}
+	if m&ENABLE_VIRTUAL_TERMINAL_PROCESSING != 0 {
+		return os.Stdout
+	}
+	return colorable.NewColorableStdout()
+}