Update README.md

Author: sksamuel

README.md

@@ -18,6 +18,7 @@ Please create issues on the main kotest [board](https://github.com/kotest/kotest
 
 * Deprecated older extensions and introduced `JdbcDatabaseContainerExtension` and `ContainerExtension` extensions
 * Deprecated Kafka extensions in favour of the `kotest-extensions-testcontainers-kafka` module
+* Added kafka container `.producer()`, `.consumer()` and `.admin()` extension methods for opening producers, consumers and admin clients.
 * Added `DockerComposeContainerExtension` for executing test containers from docker compose files.
 * Added `kotest-extensions-testcontainers-elastic` and `kotest-extensions-testcontainers-localstack`
 * Deprecated per-test lifecycle modes