message: Update bech32 to be optional
diff: @@ -7,7 +7,7 @@ export const enum NetworkType {
  export interface UtxoNetwork {
  messagePrefix: string;
  - bech32: string;
  + bech32?: string;
  bip32: {
  public: number;
  private: number;
  @@ -71,7 +71,6 @@ class BitcoinTestnet extends Testnet implements UtxoNetwork {
  // BCH inherits a fair bit of config from Bitcoin
  class BitcoinCash extends Mainnet implements UtxoNetwork {
  messagePrefix = Bitcoin.prototype.messagePrefix;
  - bech32 = Bitcoin.prototype.bech32;
  bip32 = {
  public: Bitcoin.prototype.bip32.public,
  private: Bitcoin.prototype.bip32.private,
  @@ -85,7 +84,6 @@ class BitcoinCash extends Mainnet implements UtxoNetwork {
  // TBCH inherits a fair bit of config from BitcoinTestnet
  class BitcoinCashTestnet extends Testnet implements UtxoNetwork {
  messagePrefix = Bitcoin.prototype.messagePrefix;
  - bech32 = BitcoinTestnet.prototype.bech32;
  bip32 = {
  public: BitcoinTestnet.prototype.bip32.public,
  private: BitcoinTestnet.prototype.bip32.private,
  