doc: fix badge url

README.md

@@ -1,4 +1,4 @@
-# npm-registry-fetch [![npm version](https://img.shields.io/npm/v/npm-registry-fetch.svg)](https://npm.im/npm-registry-fetch) [![license](https://img.shields.io/npm/l/npm-registry-fetch.svg)](https://npm.im/npm-registry-fetch) [![Travis](https://img.shields.io/travis/npm/npm-registry-fetch/latest.svg)](https://travis-ci.org/npm/npm-registry-fetch) [![AppVeyor](https://img.shields.io/appveyor/ci/zkat/npm-registry-fetch/latest.svg)](https://ci.appveyor.com/project/npm/npm-registry-fetch) [![Coverage Status](https://coveralls.io/repos/github/npm/npm-registry-fetch/badge.svg?branch=latest)](https://coveralls.io/github/npm/npm-registry-fetch?branch=latest)
+# npm-registry-fetch [![npm version](https://img.shields.io/npm/v/npm-registry-fetch.svg)](https://npm.im/npm-registry-fetch) [![license](https://img.shields.io/npm/l/npm-registry-fetch.svg)](https://npm.im/npm-registry-fetch) [![Travis](https://img.shields.io/travis/npm/npm-registry-fetch/latest.svg)](https://travis-ci.org/npm/npm-registry-fetch) [![AppVeyor](https://img.shields.io/appveyor/ci/npm/npm-registry-fetch/latest.svg)](https://ci.appveyor.com/project/npm/npm-registry-fetch) [![Coverage Status](https://coveralls.io/repos/github/npm/npm-registry-fetch/badge.svg?branch=latest)](https://coveralls.io/github/npm/npm-registry-fetch?branch=latest)
 
 [`npm-registry-fetch`](https://github.com/npm/npm-registry-fetch) is a Node.js
 library that implements a `fetch`-like API for accessing npm registry APIs