Updated the client version in the readme to 5.3.0

Author: Gabriela Achim

README.md

@@ -18,7 +18,7 @@ Using Maven:
     <dependency>
       <groupId>org.nameapi.client</groupId>
       <artifactId>nameapi-client</artifactId>
-      <version>5.0.1</version>
+      <version>5.3.0</version>
     </dependency>
 
 Or you can download the jar, or check out the source code from this GitHub project.