Merge pull request #533 from geekan/patch-1

Update free-programming-books-zh.md
11 years ago · c53127a048
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 * [Coursera](https://www.coursera.org/courses?orderby=upcoming&lngs=zh)
 * [Udacity](https://www.udacity.com/)
 * [xuetangX](https://www.xuetangx.com/)
+* [Codecademy](http://www.codecademy.com/)

 ###软件开发方法
 * [硝烟中的Scrum和XP](http://www.infoq.com/cn/minibooks/scrum-xp-from-the-trenches)