changed books method name to get_books

bellapanghulan_reading/bookshelf/templates/bookshelf/author_details.html

@@ -15,7 +15,7 @@
         <h3>Books by {{ object }} I love:</h3>
         <div class="book-list">
             <ul>
-                {% for book in object.books %}
+                {% for book in object.get_books %}
                 <li><a href="{{ book.get_absolute_url }}">{{ book }}</a></li>
                 {% endfor %}
             </ul>