Update README.md

includevsimport · Oct 13, 2016 · 9d3cc92 · 9d3cc92
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 # 关注我的微信公众号学习更多技术
-《第二行代码》全书的源代码
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+![qrcode](https://raw.githubusercontent.com/guolindev/booksource/master/qrcode.jpg)