little code style changes

database.py

@@ -2,10 +2,11 @@ from logging import Logger
 import psycopg2
 from psycopg2.extensions import connection
 from psycopg2.extras import DictCursor, DictRow
-from exceptions import DisplayableException
 from yoyo import read_migrations, get_backend
+from exceptions import DisplayableException
 from rss import FeedItem
 
+
 class Database:
     """Implement interaction with the database."""