Move download all setting to config.py

main.py

@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 import argparse
 import logging
-import os
 import sys
 
 from config import Config
@@ -42,7 +41,7 @@ def main():
     if args.notes:
         Config.INVOICE_NOTES = args.notes
     if args.all_years:
-        os.environ["DOWNLOAD_ALL_YEARS"] = "true"
+        Config.DOWNLOAD_ALL_YEARS = True
 
     try:
         Config.validate()