add flake8 exception for sql line length

Author: xgi

.flake8

@@ -5,4 +5,6 @@ exclude =
     __pycache__,
     build,
     dist,
-    venv
+    venv
+per-file-ignores =
+    ./castero/database.py:E501

castero/database.py

@@ -146,7 +146,7 @@ def replace_episode(self, feed: Feed, episode: Episode) -> None:
 
         Episode instances have an ep_id field which is the episode's unique id
         in the database, if set. If it was not set when this method is called,
-        we update it after the episode has been added to the database. 
+        we update it after the episode has been added to the database.
 
         Args:
             feed: the Feed the episode is a part of