Update README.md (#60)
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[![Dart CI](https://github.com/dart-lang/isolate/actions/workflows/test-package.yml/badge.svg)](https://github.com/dart-lang/isolate/actions/workflows/test-package.yml)
+# DISCONTINUED
+
+This package has been discontinued, and will no longer be maintained.
+
+------------
+
+
Helps with isolates and isolate communication in Dart.
Requires the `dart:isolate` library being available.
Isolates are not available for Dart on the web.