updated commit

src/main/java/org/zipcoder/store/Cart.java

@@ -12,4 +12,14 @@ public class Cart {
     public long getId(){
         return this.id;
     }
+
+    @Override
+    public int hashCode() {
+        return super.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return super.equals(obj);
+    }
 }