just a try. probably wrong..
Merge pull request #52 from chrisqqiu/master

just a try. probably wrong..
qqren's pr
	新文件：    self-introduction/qqren.md
Merge pull request #55 from qqren/master

qqren's pull request
changge
Merge branch 'master' of https://github.com/tuoxiaozhong/prerequisite