Updated Cassandra instructions [skip ci]

ankane · Apr 21, 2022 · 2dbbcc2 · 2dbbcc2
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diff --git a/README.md b/README.md
@@ -710,7 +710,7 @@ Use a read-only user. Requires the [Thrift server](https://spark.apache.org/docs
 
 ### Cassandra
 
-Add [cassandra-driver](https://github.com/datastax/ruby-driver) to your Gemfile and set:
+Add [cassandra-driver](https://github.com/datastax/ruby-driver) (and [sorted_set](https://github.com/knu/sorted_set) for Ruby 3+) to your Gemfile and set:
 
 ```yml
 data_sources: