new_contents: import rng
  import requests
  import shutil
  
  # Get the number of the latest xkcd
  current_xkcd_num = int(requests.get('http://xkcd.com/info.0.json').json()['num'])
  
  # Generate a random number using rng.py (expecting a natural number)
  # Mod it by current_xkcd_num to give us the number of a valid xkcd comic
  random_xkcd_num = rng.get_random_number() % current_xkcd_num
  
  # Get the URL of the image of the random comic
  img_url = requests.get('http://xkcd.com/' + str(random_xkcd_num) + '/info.0.json').json()['img']
  
  # Get the random comic and save it as 'dank.png'
  response_img = requests.get(img_url, stream=True)
  with open('dank.png', 'wb') as out_file:
      shutil.copyfileobj(response_img.raw, out_file)
subject: Add random-xkcd