input: Write a python function to sort a list of integers in ascending order.
  assert sort_integers([2, 7, 4, 5]) == [2, 4, 5, 7]
  assert sort_integers([10, 1, 3, 8, 7]) == [1, 3, 7, 8, 10]
  assert sort_integers([5, 3, 1, 2, 4]) == [1, 2, 3, 4, 5]
output: def sort_integers(lst):
      return sorted(lst)