update community joining link in README.md

the old link was directing to the google group which is not active anymore and it took me a while to join the community via new link. I hope this new link will minimise the confusion and will help other new contributors too.

update community joining link in README.md
the old link was directing to the google group which is not active anymore and it took me a while to join the community via new link. I hope this new link will minimise the confusion and will help other new contributors too.
7487f28f · Shivani singh · Evan W. Patton · 7c7c9bdb · 7487f28f
Commit 7487f28f authored Nov 29, 2019 by Shivani singh Committed by Evan W. Patton Dec 02, 2019
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@@ -121,4 +121,4 @@ The automated tests depend on [Phantomjs](http://phantomjs.org/). Make sure you
    $ ant tests
 ## Need help?
-Contact us through our [Google Group](https://groups.google.com/forum/#!forum/app-inventor-open-source-dev).
+Join [our community](https://community.appinventor.mit.edu/).