add current year to filtering context

src/main/java/com/commafeed/backend/service/FeedEntryFilteringService.java

@@ -1,5 +1,6 @@
 package com.commafeed.backend.service;
 
+import java.time.Year;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
@@ -91,6 +92,8 @@ public class FeedEntryFilteringService {
 		context.set("url", entry.getUrl() == null ? "" : entry.getUrl().toLowerCase());
 		context.set("categories", entry.getContent().getCategories() == null ? "" : entry.getContent().getCategories().toLowerCase());
 
+		context.set("year", Year.now().getValue());
+
 		Callable<Object> callable = script.callable(context);
 		Future<Object> future = executor.submit(callable);
 		Object result = null;