simplify

cmd/root.go

@@ -13,7 +13,7 @@ var (
 	from    string
 	to      string
 	rootCmd = &cobra.Command{
-		Use:   "converter",
+		Use:   "converter FROM TO VALUE",
 		Short: "A brief description of your application",
 		Long: `A longer description that spans multiple lines and likely contains
 examples and usage of using your application. For example:
@@ -55,3 +55,8 @@ func Execute() {
 		os.Exit(1)
 	}
 }
+
+func init() {
+	rootCmd.InitDefaultHelpFlag()
+	rootCmd.Flags().MarkHidden("help")
+}