Replace timezone.make_aware with timezone_make_aware.

zerver/lib/export.py

@@ -6,7 +6,7 @@ from boto.s3.connection import S3Connection
 from django.conf import settings
 from django.db import connection
 from django.forms.models import model_to_dict
-from django.utils import timezone
+from django.utils.timezone import make_aware as timezone_make_aware
 from django.utils.timezone import utc as timezone_utc
 from django.utils.timezone import is_naive as timezone_is_naive
 from django.db.models.query import QuerySet
@@ -181,7 +181,7 @@ def floatify_datetime_fields(data, table):
                 continue
             if timezone_is_naive(orig_dt):
                 logging.warning("Naive datetime:", item)
-                dt = timezone.make_aware(orig_dt)
+                dt = timezone_make_aware(orig_dt)
             else:
                 dt = orig_dt
             utc_naive  = dt.replace(tzinfo=None) - dt.utcoffset()