Add BIP141 tab

[iancoleman]

BIP49 uses P2WPKH Nested In P2SH

This is also currently provided as an option in the BIP32 tab.

But BIP141 specifies several other formats for segwit addresses.

https://github.com/bitcoin/bips/blob/master/bip-0141.mediawiki#Examples

• P2WPKH
• P2WPKH nested in BIP16 P2SH
• P2WSH
• P2WSH nested in BIP16 P2SH

Maybe the tool could facilitate the generation of these other types of addresses

[iancoleman]

See

• https://github.com/iancoleman/bip39/commit/9f59e99bec5cc5faa63c0296f064a09b0745291f - Update bitcoinjs from v3.1.1 to v3.3.0
• https://github.com/iancoleman/bip39/commit/0fd67b5915a08168d31caaa581f55cf86591be73 - Remove segwit from bip32 tab
• https://github.com/iancoleman/bip39/commit/c49e881294343b762109bb8104e7c1b45898c894 - Add BIP141 tab for full segwit compatibility

P2WSH and P2WSH-in-P2SH do not apply to this tool.