Update solution 136 [Python3]

Author: chakyam

solution/136.Single Number/Solution.py

@@ -0,0 +1,10 @@
+class Solution:
+    def singleNumber(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: int
+        """
+        res=0
+        for i in nums:
+            res = res^i
+        return res