bump version to 8.4.0

Author: craigtaverner

README.md

@@ -19,14 +19,14 @@ ES-Hadoop 2.0.x and 2.1.x are compatible with Elasticsearch __1.X__ *only*
 
 ## Installation
 
-### Stable Release (currently `8.2.1`)
+### Stable Release (currently `8.3.0`)
 Available through any Maven-compatible tool:
 
 ```xml
 <dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch-hadoop</artifactId>
-  <version>8.2.1</version>
+  <version>8.3.0</version>
 </dependency>
 ```
 or as a stand-alone [ZIP](http://www.elastic.co/downloads/hadoop).
@@ -38,7 +38,7 @@ Grab the latest nightly build from the [repository](http://oss.sonatype.org/cont
 <dependency>
   <groupId>org.elasticsearch</groupId>
   <artifactId>elasticsearch-hadoop</artifactId>
-  <version>8.3.0-SNAPSHOT</version>
+  <version>8.4.0-SNAPSHOT</version>
 </dependency>
 ```