input: Write a function to generate a random number between 0 and 9. If the generated number is divisible by 5, return True, otherwise return False.
  assert divisible_by_five(random.randint(0,9)) in [True, False]
  assert divisible_by_five(random.randint(0,9)) in [True, False]
  assert divisible_by_five(random.randint(0,9)) in [True, False]
  assert divisible_by_five(random.randint(0,9)) in [True, False]
  assert divisible_by_five(random.randint(0,9)) in [True, False]
output: def divisible_by_five(num):
      return num % 5 == 0