input: Write a python function to find the minimum value in an IntList instance.
  assert find_min_in_intlist([10, 20, 5, 40]) == 5
  assert find_min_in_intlist([7, 3, 9, 2, 5]) == 2
  assert find_min_in_intlist([11, 25, 15, 7, 30]) == 7
output: def find_min_in_intlist(int_list):
      return min(int_list)