Update README.md

README.md

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 # WeChat SDK for Go
 [![Build Status](https://travis-ci.org/silenceper/wechat.svg?branch=master)](https://travis-ci.org/silenceper/wechat)
 [![Go Report Card](https://goreportcard.com/badge/github.com/silenceper/wechat)](https://goreportcard.com/report/github.com/silenceper/wechat)
-[![GoDoc]
-(http://godoc.org/github.com/silenceper/wechat?status.svg)](http://godoc.org/github.com/silenceper/wechat)
+[![GoDoc](http://godoc.org/github.com/silenceper/wechat?status.svg)](http://godoc.org/github.com/silenceper/wechat)
 
 
 使用Golang开发的微信SDK，简单、易用。