correct zimports issue

Change-Id: If83ef4b19a20421598dc18dbbc5ebff0f645c237

Author: zzzeek

tests/test_autogen_render.py

@@ -48,8 +48,8 @@
 from alembic.testing import config
 from alembic.testing import eq_
 from alembic.testing import eq_ignore_whitespace
-from alembic.testing import mock
 from alembic.testing import is_not_
+from alembic.testing import mock
 from alembic.testing import TestBase
 from alembic.testing.fixtures import op_fixture
 from alembic.util import sqla_compat