input: Write a function to find the maximum value in a list of integers.
  assert findMax([1, 2, 3, 4, 5]) == 5
  assert findMax([10, 20, 5, 7, 3]) == 20
  assert findMax([-1, -2, -3, -4, -5]) == -1
output: def findMax(lst):
      return max(lst)