### Features

#### Sort pages collection by `updated` date

When you applied the `sort_by_date` filter on a pages collection it use the `date` variable value by default.  
You can change this behavior and use `updated` variable value instead of `date`:

```twig
{{ pages|sort_by_date }} # filter on "date" value
{{ pages|sort_by_date('updated') }} # filter on "updated" value
```

### Fixes

- The default date of a page in now based on file last modified date (PHP `getMTime`)