Flag if Advanced Custom Fields plugin version is 4.*

## Describe the solution you'd like

On https://docs.wpvip.com/technical-references/plugins/acf-5-and-vip-go/, we prohibit using any ACF version 4:

> Please note that while ACF version 5 can be used on most VIP Go sites (at customer discretion), ACF 4 should not be used.

## What code should be reported as a violation?

```
/*
Plugin Name: Advanced Custom Fields
Plugin URI: http://www.advancedcustomfields.com/
Description: Customise WordPress with powerful, professional and intuitive fields
Version: 4.4.4
Author: Elliot Condon
Author URI: https://www.advancedcustomfields.com
Text Domain: acf
Domain Path: /lang
*/

```

```
/*
Plugin Name: Advanced Custom Fields PRO
Plugin URI: http://www.advancedcustomfields.com/
Description: Customise WordPress with powerful, professional and intuitive fields
Version: 4.4.4
Author: Elliot Condon
Author URI: https://www.advancedcustomfields.com
Text Domain: acf
Domain Path: /lang
*/

```

## What code should *not* be reported as a violation?

```
/*
Plugin Name: Advanced Custom Fields
Plugin URI: https://www.advancedcustomfields.com
Description: Customize WordPress with powerful, professional and intuitive fields.
Version: 5.9.5
Author: Elliot Condon
Author URI: https://www.advancedcustomfields.com
Text Domain: acf
Domain Path: /lang
*/
```

```
/*
Plugin Name: Advanced Custom Fields PRO
Plugin URI: https://www.advancedcustomfields.com
Description: Customize WordPress with powerful, professional and intuitive fields.
Version: 5.9.5
Author: Elliot Condon
Author URI: https://www.advancedcustomfields.com
Text Domain: acf
Domain Path: /lang
*/

```

Individua i controlli esistenti per plugin-header e versione e i relativi test, quindi confrontali con gli esempi di ACF 4.4.4 e 5.9.5 in questa issue. Il lavoro è completato quando ACF e ACF PRO della versione 4.* vengono segnalati come violazioni, mentre la versione 5.* non lo viene, e i test coprono entrambi i casi.

Scritto dal modello di indicizzazione a partire dal testo della issue.