Update ISet.java

src/edu/caltech/cs2/interfaces/ISet.java

@@ -55,6 +55,7 @@ public class ISet<E> implements Iterable<E> {
      *
      * @return an iterator over the elements in this set
      */
+    @Override
     public Iterator<E> iterator() {
         return this.internalDictionary.iterator();
     }