input: Write a python function that sums up successive pairs of numbers in a given list.
  assert add_successive_pairs([1, 1, 3, 4, 4, 5, 6, 7])==[2, 4, 7, 8, 9, 11, 13]
  assert add_successive_pairs([4, 5, 8, 9, 6, 10])==[9, 13, 17, 15, 16]
  assert add_successive_pairs([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])==[3, 5, 7, 9, 11, 13, 15, 17, 19]
output: def add_successive_pairs(lst):
      return [lst[i] + lst[i + 1] for i in range(len(lst) - 1)]