message: updated tests and comment
diff: @@ -262,7 +262,7 @@ class AbstractUtxoCoin extends BaseCoin {
  debug('Address %s presumed external', currentAddress);
  return _.extend({}, currentOutput, { external: true });
  } else if (e.message.includes('address validation failure: invalid chain') && currentAddress === txParams.changeAddress) {
  - // expect to see this error when passing in a changeAddress with no chain or index
  + // expect to see this error when passing in a custom changeAddress with no chain or index
  return _.extend({}, currentOutput, { external: false });
  }
  