Switch to urfave/cli/v2... again.

main.go

@@ -22,10 +22,9 @@ func main() {
 	app.Name = "gotty"
 	app.Version = Version + "+" + CommitID
 	app.Usage = "Share your terminal as a web application"
-	app.HideHelp = true
-	cli.AppHelpTemplate = helpTemplate
-
+	app.HideHelpCommand = true
 	appOptions := &server.Options{}
+
 	if err := utils.ApplyDefaultValues(appOptions); err != nil {
 		exit(err, 1)
 	}