Update README.md

Author: pojozhang

README.md

@@ -3,10 +3,9 @@
 </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) 
+[![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 is a **DECLARATIVE** http client providing elegant APIs for Golang.
 
 ### [中文文档](README.zh-cn.md)
@@ -337,4 +336,4 @@ switch e := err.(type) {
 		// your code
 	}
 // your code
-```
+```