Cmake 实践 的地址 404 fixed #671

Author: justjavac

README.md

@@ -360,7 +360,6 @@
 * [Google C++ 风格指南](http://zh-google-styleguide.readthedocs.org/en/latest/google-cpp-styleguide/contents/)
 * [C/C++ Primer](https://github.com/andycai/cprimer) (by @andycai)
 * [简单易懂的C魔法](http://www.nowamagic.net/librarys/books/contents/c)
-* [Cmake 实践](http://sewm.pku.edu.cn/src/paradise/reference/CMake%20Practice.pdf) (PDF版)
 * [C++ FAQ LITE(中文版)](http://www.sunistudio.com/cppfaq/)
 * [C++ Primer 5th Answers](https://github.com/Mooophy/Cpp-Primer)
 * [C++ 并发编程(基于C++11)](https://www.gitbook.com/book/chenxiaowei/cpp_concurrency_in_action/details)