plugin seems to be built with java version that does not support java 8

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1898541 13f79535-47bb-0310-9956-ffa450edef68

build.gradle

@@ -40,7 +40,7 @@ plugins {
     id('org.nosphere.apache.rat') version '0.7.0'
     id 'distribution'
     id "com.github.spotbugs" version "4.8.0"
-    id 'com.github.jk1.dependency-license-report' version '2.1'
+    id 'com.github.jk1.dependency-license-report' version '2.0'
 }
 
 repositories {