proposal to update README.md

[Andrew Starodubtsev]

NameError: name 'seed' is not defined
NameError: name 'sphincs' is not defined

import pyspx.shake256_128f as sphincs
import os, binascii

# Key generation: private + public key
seed = os.urandom(sphincs.crypto_sign_SEEDBYTES)

as in here

[rugo]

Don't know what you are trying to tell me.