Fix linting

Author: devinmatte

packet/notifications.py

@@ -48,7 +48,7 @@ def packet_signed_notification(packet: Packet, signer: str) -> None:
     subscriptions = NotificationSubscription.query.filter_by(freshman_username=packet.freshman_username)
     if subscriptions:
         notification_body = post_body
-        notification_body['contents']['en'] = signer + " signed your packet!"
+        notification_body['contents']['en'] = signer + ' signed your packet!'
         notification_body['headings']['en'] = 'New Packet Signature!'
         notification_body['chrome_web_icon'] = 'https://profiles.csh.rit.edu/image/' + signer
         notification_body['url'] = app.config['PROTOCOL'] + app.config['PACKET_INTRO']