input: Write a python function to reverse a list of integers.
  assert reverse_list([1, 3, 6, 8, 10]) == [10, 8, 6, 3, 1]
  assert reverse_list([5, 4, 3, 2, 1]) == [1, 2, 3, 4, 5]
  assert reverse_list([7, 14, 21, 28]) == [28, 21, 14, 7]
output: def reverse_list(lst):
      return lst[::-1]