modify doc format

readme.md

@@ -3,9 +3,10 @@
 A library, which can create validators to validate request parameters easily. 
 
 [![NPM](https://nodei.co/npm/validator-param.png?downloads=true)](https://nodei.co/npm/validator-param/)  
-[![Test coverage][https://img.shields.io/coveralls/yunnysunny/validator-param.svg?style=flat-square]][https://coveralls.io/r/yunnysunny/validator-param?branch=master]
+
 [![NPM version](https://img.shields.io/npm/v/validator-param.svg?style=flat-square)](https://npmjs.com/package/validator-param)
 [![Build status](https://travis-ci.org/yunnysunny/validator-param.svg?branch=master)](https://travis-ci.org/yunnysunny/validator-param)
+[![Test coverage](https://img.shields.io/coveralls/yunnysunny/validator-param.svg?style=flat-square)](https://coveralls.io/r/yunnysunny/validator-param?branch=master)
 
 ## Install
 ```npm install validator-param --save```