[FEATURE REQUEST] Add BusKill

[maltfield]

This ticket is a request to update the Awesome-Windows list's Security section to include BusKill.

BusKill is an open-source hardware and software project that uses a hardware tripwire/dead-man-switch (a usb cable with a magnetic breakaway) to trigger your computer to lock or shutdown if the user is physically separated from their machine.

• https://github.com/BusKill/buskill-app