Update README.adoc

Author: source-c

README.adoc

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 A Clojure library for the Apache Kafka stream-processing software platform.
 
 NOTE: This version is well tested with Kafka v2.2.0
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 image:https://img.shields.io/clojars/v/net.tbt-post/clj-kafka-x.svg[]
 
 CAUTION: `v0.4.0` may be partially (or even fully!) incompatible with some versions of other libraries that use NIO!