Merge pull request #822

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Update free-programming-books-zh.md
11 years ago · 2724383bbe
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 * [Udacity](https://www.udacity.com/)
 * [xuetangX](https://www.xuetangx.com/)
 * [Codecademy](http://www.codecademy.com/?locale_code=zh)
 * [CodeSchool](https://www.codeschool.com/)
 ###软件开发方法