Update README.md

[n0k0m3]

Editing current SMBIOS (Macmini8,1) to one that requires ACPI changes will cause forbidden sign at first boot. This commit is to clarify that only these fields should be edited

[zearp]

Changing the SMBIOS is not supported. The README is very clear on which fields to change, anything else that gets changed can result in a non-booting/broken system as is done at the users own risk. I don't think it has to be clarified or changed. When someone follows the guide the only changes made will be the fields mentioned and nothing else.

Edit config.plist with [ProperTree](https://github.com/corpnewt/ProperTree) and change the following fields;