docs: version update (#472)

@eaball35

Author: elharo

README.md

@@ -39,7 +39,7 @@ If you are using Maven without BOM, add this to your dependencies:
 <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-dlp</artifactId>
- <version>2.2.9</version>
+ <version>2.3.0</version>
 </dependency>
 
 ```