message: nft: add view keyword to functions in `IOptimismMintableERC721`
diff: @@ -30,17 +30,17 @@ interface IOptimismMintableERC721 is IERC721Enumerable {
  /**
  * @notice Chain ID of the chain where the remote token is deployed.
  */
  - function remoteChainId() external returns (uint256);
  + function remoteChainId() external view returns (uint256);
  /**
  * @notice Address of the token on the remote domain.
  */
  - function remoteToken() external returns (address);
  + function remoteToken() external view returns (address);
  /**
  * @notice Address of the ERC721 bridge on this network.
  */
  - function bridge() external returns (address);
  + function bridge() external view returns (address);
  /**
  * @notice Mints some token ID for a user.
  