Broken Link(404) (#8173)

books/free-programming-books-zh.md

@@ -433,7 +433,6 @@
 * [网易斯坦福大学公开课：iOS 7应用开发字幕文件](https://github.com/jkyin/Subtitle)
 * [Apple Watch开发初探](http://nilsun.github.io/apple-watch/)
 * [Google Objective-C Style Guide 中文版](http://zh-google-styleguide.readthedocs.org/en/latest/google-objc-styleguide/)
-* [iOS7人机界面指南](http://isux.tencent.com/ios-human-interface-guidelines-ui-design-basics-ios7.html)
 * [iOS开发60分钟入门](https://github.com/qinjx/30min_guides/blob/master/ios.md)
 * [iPhone 6 屏幕揭秘](http://wileam.com/iphone-6-screen-cn/)