Update README.md

Philo · web-flow · commit 204b6f2a9d06 · 2016-07-15T12:13:11.000+01:00
diff --git a/README.md b/README.md
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 # cake-webpack
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+[![Build status](https://ci.appveyor.com/api/projects/status/b9g04sfvnytng3nx/branch/master?svg=true)](https://ci.appveyor.com/project/Philo/cake-webpack/branch/master)
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 Aliases to assist with running Webpack from Cake build scripts
 
 ## Usage
