Can the toPublic method add an pubkey_prefix parameter for user-defined use?

https://github.com/EOSIO/eosjs-ecc/blob/2063257e8d02e82ce4ca1d0fdadf451281b33d1e/src/key_private.js#L62

### Original edition
```
function toPublic() {
if (public_key) {
// cache
// S L O W in the browser
return public_key
}
const Q = secp256k1.G.multiply(d);
return public_key = PublicKey.fromPoint(Q);
}
```
### Revised
```
function toPublic(pubkey_prefix = 'EOS') {
if (public_key) {
// cache
// S L O W in the browser
return public_key
}
const Q = secp256k1.G.multiply(d);
return public_key = PublicKey.fromPoint(Q, pubkey_prefix );
}
```

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