Merge pull request #890 from fly-1-1/airdrop-fix

fix:airdrop.sol check conditions

Author: XdpCs

33_Airdrop/Airdrop.sol

@@ -25,9 +25,9 @@ contract Airdrop {
         );
         IERC20 token = IERC20(_token); // 声明IERC合约变量
         uint _amountSum = getSum(_amounts); // 计算空投代币总量
-        // 检查：授权代币数量 > 空投代币总量
+        // 检查：授权代币数量 >= 空投代币总量
         require(
-            token.allowance(msg.sender, address(this)) > _amountSum,
+            token.allowance(msg.sender, address(this)) >= _amountSum,
             "Need Approve ERC20 token"
         );