Small fix

dmnverifierapi/src/main/java/de/unikoblenz/fgbks/core/dmn/verification/verifier/impl/OverlappingVerifier.java

@@ -37,7 +37,7 @@ public class OverlappingVerifier extends AbstractVerifier {
 
   private void checkOverlapping(VDmnDecisionTable dmnDecisionTable) {
     checkOverlapping(
-        new ArrayList<VDmnInputColumn>(dmnDecisionTable.getInputColumns()),
+        new ArrayList<>(dmnDecisionTable.getInputColumns()),
         0,
         dmnDecisionTable.getRulesIds(),
         false,
@@ -45,7 +45,7 @@ public class OverlappingVerifier extends AbstractVerifier {
   }
 
   private void checkOverlapping(
-      ArrayList<VDmnInputColumn> inColumns,
+      List<VDmnInputColumn> inColumns,
       int i,
       List<RuleId> currentRuleIds,
       boolean hasOverlap,