remove build num

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

main.go

@@ -12,7 +12,6 @@ import (
 // Version set at compile-time
 var (
 	Version string
-	BuildNum string
 )
 
 func main() {
@@ -20,6 +19,7 @@ func main() {
 	app.Name = "telegram plugin"
 	app.Usage = "telegram plugin"
 	app.Action = run
+	app.Version = Version
 	app.Flags = []cli.Flag{
 		cli.StringFlag{
 			Name:   "token",
@@ -227,12 +227,6 @@ func main() {
 		},
 	}
 
-	app.Version = Version
-
-	if BuildNum != "" {
-		app.Version = app.Version + "+" + BuildNum
-	}
-
 	if err := app.Run(os.Args); err != nil {
 		log.Fatal(err)
 	}