Latest version of com.google.protobuf:protobuf-java
https://javadoc.io/doc/com.google.protobuf/protobuf-java
Current version 2.6.1
https://javadoc.io/doc/com.google.protobuf/protobuf-java/2.6.1
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.protobuf/protobuf-java/2.6.1/package-list