Update README.md for release 16.0.3 (#547)

Author: jradcliff

README.md

@@ -23,12 +23,12 @@ This project hosts the Java client library for the Google Ads API.
     <dependency>
       <groupId>com.google.api-ads</groupId>
       <artifactId>google-ads</artifactId>
-      <version>16.0.2</version>
+      <version>16.0.3</version>
     </dependency>
 
 ## Gradle dependency
 
-    implementation 'com.google.api-ads:google-ads:16.0.2'
+    implementation 'com.google.api-ads:google-ads:16.0.3'
 
 ## Documentation