Use inline assembly sstore(0, _addr) to update the owner slot (0)…

… with the new address `_addr`.

solidity-scripting/src/W4D3/MyWallet.sol

@@ -27,6 +27,8 @@ contract MyWallet {
     function transferOwnership(address _addr) public auth {
         require(_addr != address(0), "New owner is the zero address");
         require(owner != _addr, "New owner is the same as the old owner");
-        owner = _addr;
+        assembly {
+            sstore(0, _addr)
+        }
     }
 }