Changed link to use https

This is a very minor change. I just changed the link to stackoverflow to use https instead of http. ^ _ ^

README.md

@@ -35,7 +35,7 @@ This project has adopted the [Microsoft Open Source Code of Conduct](https://ope
 
 ## Feedback
 
-* Ask a question on [Stack Overflow](http://stackoverflow.com/questions/tagged/vscode).
+* Ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/vscode).
 * Request a new feature on [GitHub](CONTRIBUTING.md).
 * Vote for [popular feature requests](https://github.com/Microsoft/vscode/issues?q=is%3Aopen+is%3Aissue+label%3Afeature-request+sort%3Areactions-%2B1-desc).
 * File a bug in [GitHub Issues](https://github.com/Microsoft/vscode/issues).