add field created_at, updated_at field for AltBookConnector

src/database/connectors/AltBookConnector.py

 from ..AltConnector import AltConnector
 from database.models.Book import Book
-
+from datetime import datetime
 
 class AltBookConnector(AltConnector):
     def save_book(self, item):
@@ -10,7 +10,11 @@ class AltBookConnector(AltConnector):
         # filter item keys in table field
         real_keys = Book.__table__.columns.keys()
         real_field = {k: v for k, v in item.items() if k in real_keys}
-        real_field.update({'image_path': item['images'][0]['path']})
+        real_field.update({
+            'image_path': item['images'][0]['path'],
+            'created_at': datetime.utcnow(),
+            'updated_at': datetime.utcnow(),
+        })  # TODO
 
         sql = 'INSERT INTO books({keys}) VALUES({values}) ;'.format(
             keys=', '.join(real_field.keys()),