Update README to version 0.3.0

Author: github-actions[bot]

README.md

@@ -27,7 +27,7 @@ Release artifact
 <dependency>
     <groupId>com.github.zrdj</groupId>
     <artifactId>java-primitives</artifactId>
-    <version>0.2.0</version>
+    <version>0.3.0</version>
 </dependency>
 ```