Add hasNext to slice view.

src/main/java/app/mealsmadeeasy/api/sliceview/SliceViewService.java

@@ -15,6 +15,7 @@ public class SliceViewService {
         final Map<String, Object> sliceInfo = new HashMap<>();
         sliceInfo.put("size", slice.getSize());
         sliceInfo.put("number", slice.getNumber());
+        sliceInfo.put("hasNext", slice.hasNext());
         view.put("slice", sliceInfo);
         return view;
     }