Fixed off-by-one error

Author: kaitinghh

src/algorithms/sorting/quickSort/threeWayPartitioning/QuickSort.java

@@ -113,7 +113,7 @@ private static int[] partition(int[] arr, int start, int end) {
                     ipEnd--;
                 }
             }
-            int[] result = {eqStart - 1, eqEnd}; //return
+            int[] result = {eqStart - 1, eqEnd + 1};
             return result;
         } else {
             return null;