input: Write a function that takes two numbers as input and generates a random number between them, inclusive of both numbers.
  
  assert random_number_generator(2, 5) in [2, 3, 4, 5]
  assert random_number_generator(10, 20) in range(10, 21)
output: import random
  
  def random_number_generator(a, b):
      return random.randint(a, b)