Tidy up.

src/pricehist/fetch.py

@@ -1,5 +1,5 @@
 import logging
-from datetime import datetime, date, timedelta
+from datetime import date, datetime, timedelta
 
 
 def fetch(series, source, output, invert: bool, quantize: int, fmt) -> str:

src/pricehist/isocurrencies.py

@@ -1,4 +1,5 @@
-""" ISO 4217 Currency data
+"""
+ISO 4217 Currency data
 
 Provides `ISO 4217 <https://www.iso.org/iso-4217-currency-codes.html>`_
 currency data in a ready-to-use format, indexed by currency code. Historical

src/pricehist/sources/alphavantage.py

@@ -1,9 +1,9 @@
 import csv
 import dataclasses
-from datetime import datetime, timedelta
 import json
 import logging
 import os
+from datetime import datetime, timedelta
 from decimal import Decimal
 
 import requests