make constructor of cython HDNode struct more explicit
make constructor of cython HDNode struct more explicit

runn1ng/trezor-crypto,01BTC10/trezor-crypto,runn1ng/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto,romanz/trezor-crypto,01BTC10/trezor-crypto,romanz/trezor-crypto,trezor/trezor-crypto,01BTC10/trezor-crypto,jhoenicke/trezor-crypto,runn1ng/trezor-crypto,jhoenicke/trezor-crypto,trezor/trezor-crypto,trezor/trezor-crypto,jhoenicke/trezor-crypto,romanz/trezor-crypto,trezor/trezor-crypto,romanz/trezor-crypto,jhoenicke/trezor-crypto,trezor/trezor-crypto,runn1ng/trezor-crypto,runn1ng/trezor-crypto