input: Write a function to shuffle a list of numbers using the `random.shuffle` method. The function should return the shuffled list.
  
  assert shuffle_list([1, 2, 3, 4, 5])==[3, 5, 2, 4, 1]
  assert shuffle_list([10, 20, 30]) in [[10, 20, 30], [10, 30, 20], [20, 10, 30], [20, 30, 10], [30, 10, 20], [30, 20, 10]]
  assert shuffle_list([])==[]
output: def shuffle_list(lst):
      import random
      random.shuffle(lst)
      return lst