message: Add relayer url for eth mainnet
diff: @@ -82,6 +82,7 @@ const MAINNET = {
  name: 'Ethereum Mainnet',
  // check https://docs.tokenbridge.net/eth-xdai-amb-bridge/about-the-eth-xdai-amb for the finalization rate
  ambFinalizationRate: '20',
  + relayServiceURL: 'https://relay-ethereum.cardstack.com/api',
  };
  const GNOSIS = {
  apiBaseUrl: 'https://blockscout.com/xdai/mainnet/api',
  