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
*/

```

找到现有的 plugin-header 和版本检查及其测试，然后将它们与此 issue 中的 ACF 4.4.4 和 5.9.5 示例进行比较。完成标准是：版本 4.* 的 ACF 和 ACF PRO 被报告为违规，而版本 5.* 不被报告为违规，并且测试覆盖这两种情况。

由索引模型根据 Issue 内容生成。