[doc] alter badge order

Author: nanmu42

README.md

@@ -1,8 +1,8 @@
 # etherscan-api
 
 [![Build Status](https://travis-ci.org/nanmu42/etherscan-api.svg?branch=master)](https://travis-ci.org/nanmu42/etherscan-api)
-[![codecov](https://codecov.io/gh/nanmu42/etherscan-api/branch/master/graph/badge.svg)](https://codecov.io/gh/nanmu42/etherscan-api)
 [![Go Report Card](https://goreportcard.com/badge/github.com/nanmu42/etherscan-api)](https://goreportcard.com/report/github.com/nanmu42/etherscan-api)
+[![codecov](https://codecov.io/gh/nanmu42/etherscan-api/branch/master/graph/badge.svg)](https://codecov.io/gh/nanmu42/etherscan-api)
 [![GoDoc](https://godoc.org/github.com/nanmu42/etherscan-api?status.svg)](https://godoc.org/github.com/nanmu42/etherscan-api)
 
 Go bindings to the Etherscan.io API