input: Write a python function to find the maximum value in a list.
  assert find_max_value([1,5,2,3,8,9]) == 9
  assert find_max_value([10,20,30,40]) == 40
  assert find_max_value([-1,-5,-3,-4]) == -1
output: def find_max_value(lst):
      return max(lst)