Update README.md

Author: daggerok

README.md

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 # left fold [![Build Status](https://travis-ci.org/daggerok/fold-java.svg?branch=master)](https://travis-ci.org/daggerok/fold-java)
 Kotlin to the rescue
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+[fold the universe: reduction with java 8 streams API](https://dzone.com/articles/folding-the-universe-part-iii-java-8-list-and-stre)
+
 <!--I don't know why, but people so confused about that simple operation...-->
 
 _DomainEvents.kt_