fixed default config path

main.go

@@ -23,7 +23,7 @@ func init() {
 	log.SetOutput(os.Stderr)
 	// Parse flags
 	showVersion := flag.Bool("version", false, "Prints version information and exits")
-	configFile := flag.String("c", "jwt.example", "Use the specified `configfile`")
+	configFile := flag.String("c", "jwt.example.json", "Use the specified `configfile`")
 	flag.Parse()
 
 	// Show version and exit