message: chore(issuer): document non-erc1888 feature
diff: @@ -60,6 +60,9 @@ contract Registry is ERC1155, ERC1888 {
  return _ids;
  }
  + /*
  + * Not a part of the ERC-1888 standard - allows batch issuing to an array of _to addresses
  + */
  function batchIssueMultiple(address[] memory _to, bytes[] memory _issuanceData, uint256 _topic, uint256[] memory _values, bytes[] memory _validityCalls) external returns (uint256[] memory) {
  require(_to.length == _issuanceData.length, "Registry::batchIssueMultiple: _to and _issuanceData arrays have to be the same length");
  require(_issuanceData.length == _values.length, "Registry::batchIssueMultiple: _issuanceData and _values arrays have to be the same length");
  