Latest version of net.sf.proguard:proguard-gradle
https://javadoc.io/doc/net.sf.proguard/proguard-gradle
Current version 4.9
https://javadoc.io/doc/net.sf.proguard/proguard-gradle/4.9
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/net.sf.proguard/proguard-gradle/4.9/package-list