README: add bech32

Author: dcousens

README.md

@@ -163,6 +163,7 @@ npm run-script coverage
 - [BIP69](https://github.com/bitcoinjs/bip69) - Lexicographical Indexing of Transaction Inputs and Outputs
 - [Base58](https://github.com/cryptocoinjs/bs58) - Base58 encoding/decoding
 - [Base58 Check](https://github.com/bitcoinjs/bs58check) - Base58 check encoding/decoding
+- [Bech32](https://github.com/bitcoinjs/bech32) - A BIP173 compliant Bech32 encoding library
 - [BCoin](https://github.com/indutny/bcoin) - BIP37 / Bloom Filters / SPV client
 - [coinselect](https://github.com/bitcoinjs/coinselect) - A fee-optimizing, transaction input selection module for bitcoinjs-lib.
 - [insight](https://github.com/bitpay/insight) - A bitcoin blockchain API for web wallets.