input: Write a python function to find the minimum value in a list of numbers.
  assert find_min([4, 6, 2, 1, 10, 8]) == 1
  assert find_min([10, 20, 30, 5, 15]) == 5
  assert find_min([100, 50, 200, 25, 75]) == 25
output: def find_min(numbers):
      return min(numbers)