Update README.md

pgbovine · web-flow · commit 1606ca5892e7 · 2018-03-18T22:13:24.000-07:00
diff --git a/README.md b/README.md
@@ -5,6 +5,7 @@ This tool was created by [Philip Guo](http://pgbovine.net/) in January 2010. [Se
 The latest development version of the code is in [v5-unity](v5-unity/),
 although lots of legacy documentation still resides in [v3](v3/).
 
+- [Unsupported features and known bugs](https://github.com/pgbovine/OnlinePythonTutor/blob/master/unsupported-features.md)
 - [Frequently Asked Questions](v3/docs/user-FAQ.md)
 - [Overview for Developers](v3/docs/developer-overview.md)
 
