separate parse upvoter info in answer.py
separate parse upvoter info in answer.py

hunzhishang85/zhihu-py3,afternone/zhihu-py3,afternone/zhihu-py3,cssmlulu/zhihu-py3,cssmlulu/zhihu-py3,7sDream/zhihu-py3,hunzhishang85/zhihu-py3