input: Write a python function to generate a random number between a given range and return it.
  assert min_num <= generate_random_number(10, 25) <= max_num
  assert min_num <= generate_random_number(100, 200) <= max_num
  assert min_num <= generate_random_number(1, 5) <= max_num
output: import random
  
  def generate_random_number(min_num, max_num):
      return random.randint(min_num, max_num)