update topic.py
update topic.py

liangmingjie/zhihu-spider,angcbi/zhihu-spider,ChaofengZhou/zhihu-spider,Linkino/zhihu-spider,yyt030/zhihu-spider,dodoru/zhihu-spider,OKCrash/zhihu-spider,Ph0enixxx/zhihu-spider,MorganZhang100/zhihu-spider