input: Write a function to generate a random number between two given numbers. The function should take two parameters, the minimum and maximum values, and return a random integer between these two values. Use the `random.randint` function from the `random` module.
  assert random_number_generator(2, 5)>=2
  assert random_number_generator(2, 5)<=5
  assert isinstance(random_number_generator(2, 5), int)
output: def random_number_generator(min_val, max_val):
      return random.randint(min_val, max_val)