input: Write a python function to find the minimum element in an array.
  assert findMin([10, 11, 8, 9, 2]) == 2
  assert findMin([3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]) == 1
  assert findMin([-1, -2, -3, -4, 0]) == -4
output: def findMin(arr):
      return min(arr)