input: Write a python function to return a list of the squares of all the elements in the input list.
  assert squareList([1, 2, 3, 4, 5]) == [1, 4, 9, 16, 25]
  assert squareList([6, 7, 8, 9, 10]) == [36, 49, 64, 81, 100]
  assert squareList([0, -1, -2, -3, -4]) == [0, 1, 4, 9, 16]
output: def squareList(lst):
      return [x ** 2 for x in lst]