Merge pull request #259 from dshlstarr/patch-1

fix the Golang code for median in quick_sort.md

docs/chapter_sorting/quick_sort.md

@@ -483,7 +483,7 @@ comments: true
     func medianThree(nums []int, left, mid, right int) int {
         if (nums[left] > nums[mid]) != (nums[left] > nums[right]) {
             return left
-        } else if (nums[mid] < nums[left]) != (nums[mid] > nums[right]) {
+        } else if (nums[mid] > nums[left]) != (nums[mid] > nums[right]) {
             return mid
         }
         return right