Update README.md
Add a badge for AppVeyor.
(TBR)
diff --git a/packages/flutter_tools/README.md b/packages/flutter_tools/README.md
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# tools
[](https://travis-ci.org/flutter/tools)
+[](https://ci.appveyor.com/project/devoncarew/tools/branch/master)
[](https://pub.dartlang.org/packages/sky_tools)
Tools for building Flutter applications.