hd-wallet-addrs-v0.1.8

This release adds support for reading segwit ypub and zpub extended keys used by 3rd party wallets such as Electrum and Samourai. ypub keys generate backwards compatible p2sh style segwit addresses beginning with 3 while zpub keys generate bech32 encoded addresses beginning with bc1.

The Bitcoin-core manner of deriving segwit addresses from an xpub is not supported in this release.