minor: update UpgradeFiatToken script

script/UpgradeFiatToken.s.sol

@@ -5,7 +5,7 @@ pragma solidity ^0.8.20;
 import "forge-std/console2.sol";
 import {Script} from "forge-std/Script.sol";
 import {Upgrades, Options} from "openzeppelin-foundry-upgrades/Upgrades.sol";
-import {FiatTokenV1} from "../src/v1/FiatTokenV1.sol";
+import {FiatTokenV2} from "../src/v1/FiatTokenV2.sol";
 
 contract UpgradeFiatToken is Script {
     function run() public {
@@ -16,7 +16,7 @@ contract UpgradeFiatToken is Script {
         opts.referenceContract = "FiatTokenV1.sol";
         // upgrade contract
         Upgrades.upgradeProxy(fiatTokenProxyAddress, "FiatTokenV2.sol", "", opts);
-        console2.log("FiatTokenV1 upgraded to version 2");
+        console2.log("FiatTokenV1 upgraded to FiatTokenV2");
         vm.stopBroadcast();
     }
 }

src/v2/FiatTokenV2.sol

@@ -3,14 +3,17 @@ pragma solidity 0.8.20;
 
 import "../v1/FiatTokenV1.sol";
 
+error InvalidReInitialization(address addr);
+
 /// @custom:security-contact [email protected]
 contract FiatTokenV2 is FiatTokenV1 {
     uint8 internal _initializedVersion;
     bytes32 public constant BURNER_ROLE = keccak256("BURNER_ROLE");
 
     function initializeV2(address burner) external {
-        // solhint-disable-next-line reason-string
-        require(_initializedVersion == 0);
+        if (_initializedVersion > 0) {
+            revert InvalidReInitialization(msg.sender);
+        }
 
         _grantRole(BURNER_ROLE, burner);