squid:UnusedPrivateMethod false positive for :: (Method Reference) operator

[kuba.bo...@gmail.com]

Hi,
 this rule doesn't support Java 8, following code is causing false positives

    {
         item.getData().getLinks().stream()

                        .map(ObjectPropertiesExtractor::mapLink);
    }

    // squid:UnusedPrivateMethod
    private static LinkProperties mapLink(AcmeLinkPayload payload) {
 
   }