input: Write a python function to sort a list of integers in descending order.
  assert sort_list([5, 6, 11, 15, 20, 1, 8]) == [20, 15, 11, 8, 6, 5, 1]
  assert sort_list([10, 3, 2, 7, 8, 9]) == [10, 9, 8, 7, 3, 2]
  assert sort_list([1, 2, 3, 4, 5]) == [5, 4, 3, 2, 1]
output: def sort_list(lst):
      return sorted(lst, reverse=True)