input: Write a python function to double the values in a list using a lambda function.
  assert double_values([1, 2, 3, 4, 5]) == [2, 4, 6, 8, 10]
  assert double_values([0, -1, -2, 3]) == [0, -2, -4, 6]
  assert double_values([10, 20, 30]) == [20, 40, 60]
output: def double_values(lst):
      return list(map(lambda x: x * 2, lst))