Change build status badges to AppVeyor

Author: josesimoes

README.md

@@ -30,8 +30,8 @@ This repo contains:
 
 | Component | Build Status |
 |:-|---|
-| nanoBooter | [![Build Status](https://travis-ci.org/nanoframework/nf-interpreter.svg?branch=master)](https://travis-ci.org/nanoframework/nf-interpreter) |
-| nanoCLR | [![Build Status](https://travis-ci.org/nanoframework/nf-interpreter.svg?branch=master)](https://travis-ci.org/nanoframework/nf-interpreter) |
+| nanoBooter | [![Build status](https://ci.appveyor.com/api/projects/status/94fldjinqji4w977?svg=true)](https://ci.appveyor.com/project/nfbot/nf-interpreter) |
+| nanoCLR | [![Build status](https://ci.appveyor.com/api/projects/status/94fldjinqji4w977?svg=true)](https://ci.appveyor.com/project/nfbot/nf-interpreter) |
 | Win32 test project | [![Build status](https://ci.appveyor.com/api/projects/status/94fldjinqji4w977?svg=true)](https://ci.appveyor.com/project/nfbot/nf-interpreter) |