Added Appveyor badge

Author: chipsenkbeil

README.md

@@ -2,11 +2,12 @@ Scala Debugger
 ==============
 
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-A simple debugger library for Scala. Tested on OpenJDK 7.
+A simple debugger library for Scala. Tested on OpenJDK 7 for Windows and Linux.
 - Visit the [main site](https://scala-debugger.org/) for more documentation.
 - Check out the [wiki](https://github.com/ensime/scala-debugger/wiki) for the current roadmap.