message: Add comment describing --grep flag for gulp test task
diff: @@ -178,6 +178,7 @@ gulp.task('forceprettier', function(done) {
  // test
  gulp.task('test', function(done) {
  + // the flag --grep takes js regex as a string and filters by test and test suite names
  var knownOptions = {
  string: 'grep',
  default: { grep: '' },
  