input: Write a python function to check if a list is strictly increasing.
  assert is_strictly_increasing([1, 2, 3, 4, 5]) == True
  assert is_strictly_increasing([5, 4, 3, 2, 1]) == False
  assert is_strictly_increasing([1, 3, 2, 4, 5]) == False
output: def is_strictly_increasing(lst):
      for i in range(len(lst) - 1):
          if lst[i] >= lst[i + 1]:
              return False
      return True