Update README with new AppVeyor account badge

Author: samkearney

README.md

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 # LightWeight Platform Abstraction
 
-[![Build status](https://ci.appveyor.com/api/projects/status/pefwgtvtag7be45s/branch/master?svg=true)](https://ci.appveyor.com/project/bootress/lwpa/branch/master)
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 This repository contains the LightWeight Platform Abstraction (lwpa) library,
 which supports other open-source libraries by [ETC](http://www.etcconnect.com).