Update Crowdsale-v8.sol

Author: Alexander-Herranz

Crowdsale-v8.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-3.0
 
-pragma solidity ^0.8.1;
+pragma solidity ^0.8.0;
 
 import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.8.0/contracts/utils/Context.sol";
 import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.8.0/contracts/token/ERC20/IERC20.sol";