expose hci up down

[muka]

Forwarding here this PR to expose Up / Down as API call

moogle19#1

Can we merge it here ?

Thanks!

[moogle19]

@muka Could you make a Pull Request against this repo?

[muka]

Hi @moogle19
it's weird but for some reasons creating a PR on go-ble/ble GH creates it on moogle19/ble

See https://github.com/moogle19/ble/pulls

Maybe because it is a fork?