Fix lint

Author: Val Brodsky

libs/labelbox/src/labelbox/schema/__init__.py

@@ -1,7 +1,6 @@
 import labelbox.schema.asset_attachment
 import labelbox.schema.annotation_import
 import labelbox.schema.asset_attachment
-import labelbox.schema.bulk_import_request
 import labelbox.schema.annotation_import
 import labelbox.schema.benchmark
 import labelbox.schema.data_row