Latest version of com.google.protobuf:protobuf-gradle-plugin
https://javadoc.io/doc/com.google.protobuf/protobuf-gradle-plugin
Current version 0.9.4
https://javadoc.io/doc/com.google.protobuf/protobuf-gradle-plugin/0.9.4
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.protobuf/protobuf-gradle-plugin/0.9.4/package-list