input: Write a python function to find numbers less than a given number that are divisible by 3 or 5.
  assert divisible(10) == [3, 5, 6, 9]
  assert divisible(20) == [3, 5, 6, 9, 10, 12, 15, 18]
  assert divisible(5) == [3]
output: def divisible(n):
      return [i for i in range(1, n) if i % 3 == 0 or i % 5 == 0]