Merge pull request #103 from thomasrockhu/codecov-badge

Add Codecov badge to README

Author: halfrost

README.md

@@ -16,6 +16,7 @@
 <a href="https://travis-ci.org/github/halfrost/LeetCode-Go" rel="nofollow"><img src="https://travis-ci.org/halfrost/LeetCode-Go.svg?branch=master"></a>
 <a href="https://goreportcard.com/report/github.com/halfrost/LeetCode-Go" rel="nofollow"><img src="https://goreportcard.com/badge/github.com/halfrost/LeetCode-Go"></a>
 <img src="https://img.shields.io/badge/runtime%20beats-100%25-success">
+<a href="https://codecov.io/gh/halfrost/LeetCode-Go"><img src="https://codecov.io/gh/halfrost/LeetCode-Go/branch/master/graph/badge.svg" /></a>
 <!--<img alt="GitHub go.mod Go version" src="https://img.shields.io/github/go-mod/go-version/halfrost/LeetCode-Go?color=26C2F0">-->
 <img alt="Support Go version" src="https://img.shields.io/badge/Go-v1.15-26C2F0">
 <img src="https://visitor-badge.laobi.icu/badge?page_id=halfrost.LeetCode-Go">