update badge

README.md

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 # gotest is a Go library for test
 
+[![Golang](https://img.shields.io/badge/language-Go-brightgreen.svg?style=flat)](https://golang.org)
 [![Build Status](https://travis-ci.org/philchia/gotest.svg?branch=master)](https://travis-ci.org/philchia/gotest)
+[![Coverage Status](https://coveralls.io/repos/github/philchia/gotest/badge.svg?branch=master)](https://coveralls.io/github/philchia/gotest?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/philchia/gotest)](https://goreportcard.com/report/github.com/philchia/gotest)
+[![GoDoc](https://godoc.org/github.com/philchia/gotest?status.svg)](https://godoc.org/github.com/philchia/gotest)
+[![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://opensource.org/licenses/MIT)
 
 ## assert