input: Write a python function that filters out odd numbers from a specified list.
  assert filter_odds([1,2,3]) == [2]
  assert filter_odds([2,4,6]) == [2,4,6]
  assert filter_odds([10,20,3]) == [10,20]
output: def filter_odds(lst):
      return [num for num in lst if num % 2 == 0]