### Features

#### JSON Feed output format

Add support of [JSON Feed](https://www.jsonfeed.org/) as output format.

```yaml
output:
  pagetypeformats:
    section: ['html', 'atom', 'jsonfeed']
```

[Documentation →](/documentation/configuration/#pagetypeformats)

### Fix

- Enforcing runtime checks for required PHP extensions (by [@benjaminhirsch](https://github.com/benjaminhirsch))
- Fix pages filter and map in render step

### Miscs

- Code enhanced
- Dependencies updated
- `symfony/polyfill-intl-icu` added