Add AppVeyor and Coveralls badges to README

README.md

@@ -1,6 +1,6 @@
 # loopback-next
 
-[![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/strongloop/loopback) [![Build Status](https://img.shields.io/travis/rust-lang/rust.svg)](https://travis-ci.org/strongloop/loopback-next)
+[![Gitter](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/strongloop/loopback) [![Travis Build Status](https://img.shields.io/travis/rust-lang/rust.svg)](https://travis-ci.org/strongloop/loopback-next) [![AppVeyor Build status](https://ci.appveyor.com/api/projects/status/3v1qmusv168a0kb0/branch/master?svg=true)](https://ci.appveyor.com/project/bajtos/loopback-next/branch/master) [![Coverage Status](https://coveralls.io/repos/github/strongloop/loopback-next/badge.svg?branch=master)](https://coveralls.io/github/strongloop/loopback-next?branch=master)
 
 LoopBack makes it easy to build modern applications that require complex integrations.