refactor(cli.go): replace json.Marshal with json.MarshalIndent for be…

…tter readability of output JSON

internal/cli/cli.go

@@ -180,7 +180,7 @@ func (app *App) Run() {
 		}
 		dragoman.JSONMerge(originalOutMap, resultMap)
 
-		marshaled, err := json.Marshal(originalOutMap)
+		marshaled, err := json.MarshalIndent(originalOutMap, "", "  ")
 		if err != nil {
 			app.kong.FatalIfErrorf(err, "failed to marshal result map")
 		}