Update README.md

Author: anthonygauthier

README.md

@@ -23,7 +23,7 @@ JMeter ElasticSearch Backend Listener is a JMeter plugin enabling you to send te
 <dependency>
   <groupId>io.github.delirius325</groupId>
   <artifactId>jmeter.backendlistener.elasticsearch</artifactId>
-  <version>2.3.0</version>
+  <version>2.3.1</version>
 </dependency>
 ```