UEFI-Bootkit docs updated

Re: https://firmwaresecurity.com/2016/11/04/uefi-bootkit/

Aidan Khoury of Quarkslab has updated UEFI-Bootkit. Only change to the project in the last year was update to readme, with more info. It is worth reading the USRT review of this bootkit, in the above URL.

https://github.com/dude719/UEFI-Bootkit

UEFI-Bootkit: A small bootkit designed to use zero assembly. Make sure to compile the driver as an EFI Runtime driver (EFI_RUNTIME_DRIVER) or else the bootkit will be freed once winload.efi calls ExitBootServices! Thanks to pyro666, dreamboot, and VisualUEFI.

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