Fix PHP versions in upgrade guide

Make versions less generic, and add note about following PHP's supported versions guide
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Matt Peel 2019-12-10 12:17:55 +13:00 committed by GitHub
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@ -25,7 +25,7 @@ How easy will it be to update my project? It's a fair question, and sometimes a
There are some fundamental changes in SilverStripe 4:
* PHP 5.6 is now the minimum required version and up to PHP 7.2 is supported.
* PHP 5.6 is now the minimum required version and up to PHP 7.3 is supported. We strongly recommend you only use [supported versions of PHP](https://www.php.net/supported-versions.php).
* SilverStripe is now even more modular which allows you to remove functionality your project might not need.
* Common functionality sets can now be installed via SilverStripe _recipes_.
* SilverStripe modules can now be installed in the `vendor/` folder along with your regular PHP packages.