Add slides for Stage 2 Updates in June 2020

Author: leobalter

README.md

@@ -87,6 +87,7 @@ See some other examples [here](EXAMPLES.md).
 
 ## Presentations
 
+* [TC39 Meeting, June 4th 2020 - Stage 2 Update](https://docs.google.com/presentation/d/1TfVtfolisUrxAPflzm8wIhBBv_7ij3KLeqkfpdvpFiQ/edit?ts=5ed5d3e7)
 * [TC39 Incubator Call May 26th 2020](https://docs.google.com/presentation/d/1FMQB8fu059zSJOtC3uOCbBCYiXAcvHojxzcDjoVQYAo/edit)
 * [TC39 Feb 2020 - Stage 2 Update](https://docs.google.com/presentation/d/1umg2Kw18IlQyzrWwaQCAkeZ6xLTGZPPB6MtnI2LFzWE/edit)
 * [TC39 May 2018 - Stage 2 Request](https://docs.google.com/presentation/d/1blHLQuB3B2eBpt_FbtLgqhT6Zdwi8YAv6xhxPNA_j0A/edit) (archived)