Replace `if (...) revert()` with `require(...)` (#2376)

contracts/cryptography/ECDSA.sol

@@ -52,13 +52,8 @@ library ECDSA {
         // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
         // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
         // these malleable signatures as well.
-        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
-            revert("ECDSA: invalid signature 's' value");
-        }
-
-        if (v != 27 && v != 28) {
-            revert("ECDSA: invalid signature 'v' value");
-        }
+        require(uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value");
+        require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value");
 
         // If the signature is valid (and not malleable), return the signer address
         address signer = ecrecover(hash, v, r, s);