Update README

See docker-library/docs#2503

README.md

@@ -12,14 +12,4 @@ For more information about the full official images change lifecycle, see [the "
 
 For outstanding `cassandra` image PRs, check [PRs with the "library/cassandra" label on the official-images repository](https://github.com/docker-library/official-images/labels/library%2Fcassandra). For the current "source of truth" for [`cassandra`](https://hub.docker.com/_/cassandra/), see [the `library/cassandra` file in the official-images repository](https://github.com/docker-library/official-images/blob/master/library/cassandra).
 
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