Update README.md

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Author: edizor

core-java-modules/core-java-streams-4/README.md

@@ -5,3 +5,4 @@
 - [Filter Java Stream to 1 and Only 1 Element](https://www.baeldung.com/java-filter-stream-unique-element)
 - [Java 8 Streams: Multiple Filters vs. Complex Condition](https://www.baeldung.com/java-streams-multiple-filters-vs-condition)
 - [Finding Max Date in List Using Streams](https://www.baeldung.com/java-max-date-list-streams)
+- [Batch Processing of Stream Data in Java](https://www.baeldung.com/java-stream-batch-processing)