input: Write a function that takes two numbers as input parameters, min and max, and generates a random number between them inclusively. The function should utilize the `random.randint()` function from the `random` module to achieve this.
  
  def random_number_generator(min, max):
      return random.randint(min, max)
  
  assert random_number_generator(2, 5) in [2, 3, 4, 5]
  assert random_number_generator(10, 20) in range(10, 21)
  assert random_number_generator(-5, 5) in range(-5, 6)
output: def random_number_generator(min, max):
      return random.randint(min, max)