message: Update number-complement.py
diff: -#!/usr/bin/env python
  -# -*- coding: utf-8 -*-
  -# Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.
  +# Time: O(1)
  +# Space: O(1)
  +
  +# Given a positive integer, output its complement number.
  +# The complement strategy is to flip the bits of its binary representation.
  #
  # Note:
  # The given integer is guaranteed to fit within the range of a 32-bit signed integer.
  