input: Write a python function to generate a random number between two given integers using the random module.
  assert 10 <= generate_random_number(10, 20) <= 20
  assert 30 <= generate_random_number(30, 40) <= 40
  assert 100 <= generate_random_number(100, 200) <= 200
output: import random
  
  def generate_random_number(start, end):
      return random.randint(start, end)