input: Write a python function to generate a list of 10 unique random numbers between 10 and 20.
  assert len(generate_random_list()) == 10
  assert all(10 <= num <= 20 for num in generate_random_list())
  assert len(set(generate_random_list())) == 10
output: import random
  
  def generate_random_list():
      return random.sample(range(10, 21), 10)