Update hardcoded version to constant

Replaced all hardcoded instances of the version number "1.13.11.8" with a constant named "Version". This change will make future version updates easier and less error-prone, as the version number will only need to be updated in one place. This change affects the main.go file in the .build/bundle directory.

.build/bundle/main.go

@@ -39,6 +39,8 @@ import (
 //go:embed assets.tar.xz
 var assets embed.FS
 
+const Version = "1.13.11.8"
+
 func common() []cli.Flag {
 	homedir, _ := os.UserHomeDir()
 	return []cli.Flag{
@@ -80,7 +82,7 @@ func main() {
 
 	app := &cli.App{
 		Name:        "double-take",
-		Version:     "1.13.11.8",
+		Version:     Version,
 		Author:      "skrashevich",
 		Usage:       "double-take",
 		Description: "double-take",
@@ -238,7 +240,7 @@ func uninstall(c *cli.Context) error {
 func execute(c *cli.Context) error {
 	store := c.String("store")
 	store = filepath.Join(store, "bundle")
-	fmt.Println("Starting double-take 1.13.11.8 with store at", store)
+	fmt.Printf("Starting double-take %s with store at %s\n", Version, store)
 	if err := mountProc(store); err != nil {
 		fmt.Println("failed mounting /proc")
 	}
@@ -324,8 +326,8 @@ func start(c *cli.Context) error {
 		version = string(d)
 	}
 
-	if version != "1.13.11.8" {
-		fmt.Printf("Extracting double-take 1.13.11.8 bundle data (xz) into %s ...\n", store)
+	if version != Version {
+		fmt.Printf("Extracting double-take %s bundle data (xz) into %s ...\n", Version, store)
 		os.RemoveAll(path.Join(store, "bundle"))
 		err := copyBinary(store, c.Bool("continue-on-error"))
 		if err != nil {
@@ -334,7 +336,7 @@ func start(c *cli.Context) error {
 			}
 			fmt.Println("Failed copying binaries:", err.Error())
 		}
-		must(ioutil.WriteFile(path.Join(store, "VERSION"), []byte("1.13.11.8"), os.ModePerm))
+		must(ioutil.WriteFile(path.Join(store, "VERSION"), []byte((Version)), os.ModePerm))
 	}
 
 	var mounts []string