code update

Author: klever34

lcci/05.06.Convert Integer/README.md

@@ -94,7 +94,7 @@ impl Solution {
 ```swift
 class Solution {
     func convertInteger(_ A: Int, _ B: Int) -> Int {
-        return (A ^ B).nonzeroBitCount
+        return (Int32(A) ^ Int32(B)).nonzeroBitCount
     }
 }
 ```

lcci/05.06.Convert Integer/README_EN.md

@@ -111,7 +111,7 @@ impl Solution {
 ```swift
 class Solution {
     func convertInteger(_ A: Int, _ B: Int) -> Int {
-        return (A ^ B).nonzeroBitCount
+        return (Int32(A) ^ Int32(B)).nonzeroBitCount
     }
 }
 ```

lcci/05.06.Convert Integer/Solution.swift

@@ -1,5 +1,5 @@
 class Solution {
     func convertInteger(_ A: Int, _ B: Int) -> Int {
-        return (A ^ B).nonzeroBitCount
+        return (Int32(A) ^ Int32(B)).nonzeroBitCount
     }
-}
+}