Update free-programming-books-zh.md (#2571)

* Update free-programming-books-zh.md

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free-programming-books-zh.md

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 ### Python
 
+* [Django 1.8 中文文档](http://python.usyiyi.cn/documents/django_182/index.html)
 * [Django book 2.0](http://djangobook.py3k.cn/2.0/)
 * [Python 3 文档(简体中文) 3.2.2 documentation](http://docspy3zh.readthedocs.org/en/latest/)
 * [Python Cookbook第三版](http://python3-cookbook.readthedocs.io/zh_CN/latest/) (作者：David Beazley, Brian K.Jones 翻译：熊能)