readme: add appveyor badge

stephenplusplus · web-flow · commit e1a932acd940 · 2016-09-13T08:35:40.000-04:00
diff --git a/README.md b/README.md
@@ -3,6 +3,7 @@
 
 [![NPM Version](https://img.shields.io/npm/v/google-cloud.svg)](https://www.npmjs.org/package/google-cloud)
 [![Travis Build Status](https://travis-ci.org/GoogleCloudPlatform/google-cloud-node.svg)](https://travis-ci.org/GoogleCloudPlatform/google-cloud-node/)
+[![Appveyor Build Status](https://ci.appveyor.com/api/projects/status/github/GoogleCloudPlatform/google-cloud-node?svg=true)](https://ci.appveyor.com/project/GoogleCloudPlatform/google-cloud-node)
 [![Dependency Status](https://dependencyci.com/github/GoogleCloudPlatform/google-cloud-node/badge)](https://dependencyci.com/github/GoogleCloudPlatform/google-cloud-node)
 [![Coverage Status](https://img.shields.io/coveralls/GoogleCloudPlatform/google-cloud-node.svg)](https://coveralls.io/r/GoogleCloudPlatform/google-cloud-node?branch=master)
 
