Adding upstream version 1.2.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>

selfupdate/e2e_test.go

@@ -0,0 +1,22 @@
+package selfupdate
+
+import (
+	"os"
+	"os/exec"
+	"testing"
+)
+
+func TestRunSelfUpdateExample(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping test in short mode.")
+	}
+
+	t.Skip("TODO")
+
+	if err := exec.Command("go", "build", "../cmd/selfupdate-example").Run(); err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove("selfupdate-example")
+
+	// TODO
+}