Update README

README.md

@@ -8,5 +8,8 @@ Microsoft's downloads of VSCode are licensed under [this not-FLOSS license](http
 
 Until something more open comes around, we use the Microsoft Marketplace/Extensions in the `product.json` file. Those links are licensed under MIT as per [the comments on this issue.](https://github.com/Microsoft/vscode/issues/31168#issuecomment-317319063)
 
+### Supported OS/arch
+Currently we are only building OSX (zip) and Linux x64 (deb, rpm, and tar). If you are familiar with building Windows binaries on Travis CI + Wine please put in a PR! :blue_heart:
+
 ## License
 MIT