fix: add endline for linelint error

Author: shinsj4653

two-sum/shinsj4653.py

@@ -42,4 +42,6 @@ def twoSum(self, nums: List[int], target: int) -> List[int]:
                 return ret
 
             else:
-                diffDict[target - nums[i]] = i
+                diffDict[target - nums[i]] = i
+
+        return ret