styling fixes

app/config.py

@@ -1,5 +1,6 @@
 import json
 import os
+
 import pytz
 
 from app.cloudfoundry_config import cloud_config

app/main/views/performance.py

@@ -3,7 +3,6 @@ from itertools import groupby
 from operator import itemgetter
 from statistics import mean
 
-import pytz
 from flask import current_app, render_template
 
 from app import performance_dashboard_api_client, status_api_client

app/utils/time.py

@@ -2,8 +2,6 @@ from datetime import datetime
 
 import pytz
 from dateutil import parser
-from notifications_utils.timezones import convert_utc_to_local_timezone
-
 from flask import current_app