input: Write a python function to get the maximum value in a list.
  assert get_maximum_value([1, 5, 2, 9, -2]) == 9
  assert get_maximum_value([10, 20, 30, 40, 50]) == 50
  assert get_maximum_value([-10, -20, -30, -5]) == -5
output: def get_maximum_value(lst):
      return max(lst)