add forgotten option --vt/--vertual-threads

Author: eivanov89

Diff for: src/main/java/com/oltpbenchmark/DBWorkload.java

@@ -503,6 +503,7 @@ private static Options buildOptions(XMLConfiguration pluginConfig) {
         options.addOption("d", "directory", true, "Base directory for the result files, default is current directory");
         options.addOption(null, "dialects-export", true, "Export benchmark SQL to a dialects file");
         options.addOption("jh", "json-histograms", true, "Export histograms to JSON file");
+        options.addOption("vt", "virtual-threads", true, "Use virtual threads instead of real threads");
         return options;
     }