Update README.md with link to Skull Canyon and Hades Canyon NUC CEC adapter.

Note! Pulse-Eight has two links for it but they appear to be for the same adapter:
* https://www.pulse-eight.com/p/207/skull-canyon-nuc-cec-adapter
* https://www.pulse-eight.com/p/208/hades-canyon-nuc-cec-adapter