Update README.zh-cn.md

Author: pojozhang

README.zh-cn.md

@@ -3,7 +3,7 @@
 </p>
 
 ![GitHub (pre-)release](https://img.shields.io/github/release/pojozhang/sugar/all.svg)
-[![Build Status](https://travis-ci.org/pojozhang/sugar.svg?branch=master)](https://travis-ci.org/pojozhang/sugar) [![codecov](https://codecov.io/gh/pojozhang/sugar/branch/master/graph/badge.svg)](https://codecov.io/gh/pojozhang/sugar) [![Go Report Card](https://goreportcard.com/badge/github.com/pojozhang/sugar)](https://goreportcard.com/report/github.com/pojozhang/sugar) [![GoDoc](https://godoc.org/github.com/pojozhang/sugar?status.svg)](https://godoc.org/github.com/pojozhang/sugar) ![license](https://img.shields.io/github/license/pojozhang/sugar.svg)
+[![Build Status](https://travis-ci.org/pojozhang/sugar.svg?branch=master)](https://travis-ci.org/pojozhang/sugar) [![codecov](https://codecov.io/gh/pojozhang/sugar/branch/master/graph/badge.svg)](https://codecov.io/gh/pojozhang/sugar) [![Go Report Card](https://goreportcard.com/badge/github.com/pojozhang/sugar)](https://goreportcard.com/report/github.com/pojozhang/sugar) ![go](https://img.shields.io/badge/golang-1.9+-blue.svg) [![GoDoc](https://godoc.org/github.com/pojozhang/sugar?status.svg)](https://godoc.org/github.com/pojozhang/sugar) ![license](https://img.shields.io/github/license/pojozhang/sugar.svg)
 
 Sugar是一个Go语言编写的声明式Http客户端，提供了一些优雅的接口，目的是减少冗余的拼装代码。
 
@@ -330,4 +330,4 @@ switch e := err.(type) {
 		// ...
 	}
 // ...
-```
+```