Appended Mr. Fowler to credits section.

Author: iluwatar

README.md

@@ -444,6 +444,7 @@ The difference is the intent of the patterns. While Proxy controls access to the
 * [Java Generics and Collections](http://www.amazon.com/Java-Generics-Collections-Maurice-Naftalin/dp/0596527756/)
 * [Let’s Modify the Objects-First Approach into Design-Patterns-First](http://edu.pecinovsky.cz/papers/2006_ITiCSE_Design_Patterns_First.pdf)
 * [Pattern Languages of Program Design](http://www.amazon.com/Pattern-Languages-Program-Design-Coplien/dp/0201607344/ref=sr_1_1)
+* [Martin Fowler - Event Aggregator](http://martinfowler.com/eaaDev/EventAggregator.html)