Merge pull request #555 from edizor/master

Update README.md

Author: lor6

scala-libraries-4/README.md

@@ -4,3 +4,4 @@
 - [Introduction to scala-async](https://www.baeldung.com/scala/scala-async)
 - [Get the First N Rows of a Spark Dataframe](https://www.baeldung.com/scala/spark-dataframe-get-first-n-rows)
 - [Introduction to Skunk – Scala Driver for PostgreSQL](https://www.baeldung.com/scala/skunk-postgresql-driver)
+- [Apache Pulsar Scala Client – pulsar4s](https://www.baeldung.com/scala/pulsar4s)