Update MerkleProof.sol (#1997)

contracts/cryptography/MerkleProof.sol

@@ -16,7 +16,7 @@ library MerkleProof {
         for (uint256 i = 0; i < proof.length; i++) {
             bytes32 proofElement = proof[i];
 
-            if (computedHash < proofElement) {
+            if (computedHash <= proofElement) {
                 // Hash(current computed hash + current element of the proof)
                 computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
             } else {