Latest version of com.google.guava:guava-gwt
https://javadoc.io/doc/com.google.guava/guava-gwt
Current version 28.0-jre
https://javadoc.io/doc/com.google.guava/guava-gwt/28.0-jre
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.google.guava/guava-gwt/28.0-jre/package-list