add a note about the new repo

benfry · web-flow · commit ad31c61bc10e · 2021-06-28T17:45:24.000-04:00
diff --git a/README.md b/README.md
@@ -1,3 +1,7 @@
+# Since the release of Processing 3.5.4 in January 2020, development has moved to [a new repository](https://github.com/processing/processing4/). 
+Using a [4.0 release](https://github.com/processing/processing4/releases) (even an alpha or beta version) is recommended if you find an issue. To avoid confusion, this repo will remain open at least until a 4.0 release is the default download at https://processing.org/download. We chose to move to a new repository so that we could clean out old files accumulated over the last 20 years.
+<!-- Is there not a better way to do a callout box? -->
+
 Processing
 ==========
 
