docs:add coverage

weihongyu12 · Dec 12, 2017 · d07fe1b · d07fe1b
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diff --git a/README.md b/README.md
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 [![npm](https://img.shields.io/npm/v/think-esapi.svg)](https://www.npmjs.com/package/think-esapi)
 [![Build Status](https://travis-ci.org/weihongyu12/think-esapi.svg?branch=master)](https://travis-ci.org/weihongyu12/think-esapi)
+[![Coverage Status](https://coveralls.io/repos/github/weihongyu12/think-esapi/badge.svg?branch=master)](https://coveralls.io/github/weihongyu12/think-esapi?branch=master)
 
 An ESAPI(Enterprise Security API) extend for ThinkJS