message: json can be used with both output files at the same time
diff: @@ -305,6 +305,7 @@ pub fn initialize() -> App<'static, 'static> {
  )
  .group(ArgGroup::with_name("output_files")
  .args(&["debug_log", "output"])
  + .multiple(true)
  )
  .after_help(r#"NOTE:
  Options that take multiple values are very flexible. Consider the following ways of specifying
  