fix lint

superset/migrations/versions/260bf0649a77_migrate_x_dateunit_in_time_range.py

@@ -30,11 +30,11 @@
 import re
 
 import sqlalchemy as sa
-from sqlalchemy.exc import OperationalError
 from alembic import op
 from sqlalchemy import Column, Integer, or_, Text
 from sqlalchemy.dialects.mysql.base import MySQLDialect
 from sqlalchemy.dialects.sqlite.base import SQLiteDialect
+from sqlalchemy.exc import OperationalError
 from sqlalchemy.ext.declarative import declarative_base
 
 from superset import db