fix uni

contracts/external/Multicall.sol

@@ -1,7 +1,3 @@
-/**
- *Submitted for verification at Etherscan.io on 2019-06-10
-*/
-
 pragma solidity 0.6.9;
 pragma experimental ABIEncoderV2;
 
@@ -10,17 +6,19 @@ pragma experimental ABIEncoderV2;
 /// @author Joshua Levine <joshua@makerdao.com>
 /// @author Nick Johnson <arachnid@notdot.net>
 
+// WithValid
 contract Multicall {
     struct Call {
         address target;
         bytes callData;
     }
-    function aggregate(Call[] memory calls) public returns (uint256 blockNumber, bytes[] memory returnData) {
+    function aggregate(Call[] memory calls) public returns (uint256 blockNumber, bytes[] memory returnData, bool[] memory dataValid) {
         blockNumber = block.number;
         returnData = new bytes[](calls.length);
+        dataValid = new bool[](calls.length);
         for(uint256 i = 0; i < calls.length; i++) {
             (bool success, bytes memory ret) = calls[i].target.call(calls[i].callData);
-            require(success);
+            dataValid[i] = success;
             returnData[i] = ret;
         }
     }