Update README

Author: swannodette

README.md

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 # Closure Library
 
-***Closure Library has been archived. We no longer see it as meeting the
-needs of modern JavaScript development, and we recommend that users look
-for alternative solutions.***
+This fork of Closure Library is *actively* maintained by the Clojure team and the community.
+
+# Historical note
+
+Google stopped contributing to Closure Library on August 2024. While various reasons are
+given, the growing burden of maintaining this project for outside consumers probably weighed
+heavily on the decision.
 
 Please see [#1214](https://github.com/google/closure-library/issues/1214) for
 more details.
 
 [Previous version of this README can be found here.](https://github.com/google/closure-library/blob/a99c1558bb4cdd342fb36bbf3b9296d61b852c33/README.md)
-
-