message: fix(statics): fix BitcoinGoldTestnet derivation
  Issue:
diff: @@ -157,11 +157,11 @@ class BitcoinGold extends Mainnet implements UtxoNetwork {
  explorerUrl = 'https://btgexplorer.com/tx/';
  }
  -class BitcoinGoldTestnet extends Mainnet implements UtxoNetwork {
  +class BitcoinGoldTestnet extends Testnet implements UtxoNetwork {
  name = 'BitcoinGoldTestnet';
  family = CoinFamily.BTG;
  utxolibName = 'bitcoingoldTestnet';
  - explorerUrl = 'https://btgexplorer.com/tx/';
  + explorerUrl = undefined;
  }
  class Dash extends Mainnet implements UtxoNetwork {
  