Fix bitcoinAddress to use getPub().key.export('bytes')

src/bip32.js

@@ -132,7 +132,7 @@ BIP32key.fromMasterKey = function(seed) {
 BIP32key.prototype.getKey = function() { return this.key }
 
 BIP32key.prototype.bitcoinAddress = function() {
-    return new Address(util.sha256ripe160(this.getPub().key))
+    return new Address(util.sha256ripe160(this.getPub().key.export('bytes')))
 }
 
 module.exports = BIP32key;