Update README.md

README.md

 免费的编程中文书籍索引
 ============================
 
-[![Build Status](https://travis-ci.org/justjavac/free-programming-books-zh_CN.svg?branch=master)](https://travis-ci.org/justjavac/free-programming-books-zh_CN)
+[![](https://img.shields.io/github/issues/justjavac/free-programming-books-zh_CN.svg)](https://github.com/justjavac/free-programming-books-zh_CN/issues)  [![](https://img.shields.io/github/forks/justjavac/free-programming-books-zh_CN.svg)](https://github.com/justjavac/free-programming-books-zh_CN/network) [![](https://img.shields.io/github/stars/justjavac/free-programming-books-zh_CN.svg)](https://github.com/justjavac/free-programming-books-zh_CN/stargazers) [![](https://travis-ci.org/justjavac/free-programming-books-zh_CN.svg?branch=master)](https://travis-ci.org/justjavac/free-programming-books-zh_CN) [![](https://img.shields.io/github/release/justjavac/free-programming-books-zh_CN.svg)](https://github.com/justjavac/free-programming-books-zh_CN/releases)
 
 免费的编程中文书籍索引，欢迎投稿。