gulp-ruby-sass 编译 sass时出错,请问什么原因啊？

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gulp-ruby-sass用法变了的，看下最新的写法。
另外，用gulp-sass吧，gulp-ruby-sass很坑。

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gulp.task('styles', function () {
  return gulp.src('app/styles/*.scss')
    .pipe($.sass({
      outputStyle: 'nested', // libsass doesn't support expanded yet
      precision: 10,
      includePaths: ['.'],
      onError: console.error.bind(console, 'Sass error:')
    }))
    .pipe(gulp.dest('dist/styles'))
});

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Something Had Changed

详细点这里。