Fix watch mode

commander.js changed the way it handles options which broke this.

See:
- https://github.com/tj/commander.js/blob/master/CHANGELOG.md\#changed-2
- tj/commander.js#1409

Co-authored-by: Michael Eves <meves23@gmail.com>

bin/helm-test

@@ -14,10 +14,8 @@ program
   .option('-w, --watch', 'Watch for file changes and re-run tests')
   .parse(process.argv);
 
-app.test({
-  watch: program.watch
-}, err => {
-  if(err) {
+app.test(program.opts(), (err) => {
+  if (err) {
     logger.log(err);
     process.exit(1);
   }