add admin_reminder_email to settings

Author: claire-peters

coldfront/config/email.py

@@ -22,3 +22,4 @@
 EMAIL_ALLOCATION_EXPIRING_NOTIFICATION_DAYS = ENV.list('EMAIL_ALLOCATION_EXPIRING_NOTIFICATION_DAYS', cast=int, default=[7, 14, 30])
 EMAIL_SIGNATURE = ENV.str('EMAIL_SIGNATURE', default='', multiline=True)
 EMAIL_ADMINS_ON_ALLOCATION_EXPIRE = ENV.bool('EMAIL_ADMINS_ON_ALLOCATION_EXPIRE', default=False)
+ADMIN_REMINDER_EMAIL = ENV.str('ADMIN_REMINDER_EMAIL', default='')