docs: Tweak appveyor badge (#316)

Author: sudo-suhas

README.md

@@ -1,4 +1,4 @@
-# 🚫💩 lint-staged [![Build Status](https://travis-ci.org/okonet/lint-staged.svg?branch=master)](https://travis-ci.org/okonet/lint-staged) [![AppVeyor branch](https://img.shields.io/appveyor/ci/okonet/lint-staged/master.svg)](https://ci.appveyor.com/project/okonet/lint-staged) [![npm version](https://badge.fury.io/js/lint-staged.svg)](https://badge.fury.io/js/lint-staged) [![Codecov](https://codecov.io/gh/okonet/lint-staged/branch/master/graph/badge.svg)](https://codecov.io/gh/okonet/lint-staged)
+# 🚫💩 lint-staged [![Build Status for Linux](https://travis-ci.org/okonet/lint-staged.svg?branch=master)](https://travis-ci.org/okonet/lint-staged)  [![Build Status for Windows](https://ci.appveyor.com/api/projects/status/github/okonet/lint-staged?branch=master&svg=true)](https://ci.appveyor.com/project/okonet/lint-staged) [![npm version](https://badge.fury.io/js/lint-staged.svg)](https://badge.fury.io/js/lint-staged) [![Codecov](https://codecov.io/gh/okonet/lint-staged/branch/master/graph/badge.svg)](https://codecov.io/gh/okonet/lint-staged)
 
 Run linters against staged git files and don't let :poop: slip into your code base!