PYTHON-2504 Fix isort

Author: ShaneHarvey

bson/raw_bson.py

@@ -54,8 +54,9 @@
 from typing import Any, ItemsView, Iterator, Mapping, Optional
 
 from bson import _get_object_size, _raw_to_dict
-from bson.codec_options import _RAW_BSON_DOCUMENT_MARKER, CodecOptions
+from bson.codec_options import _RAW_BSON_DOCUMENT_MARKER
 from bson.codec_options import DEFAULT_CODEC_OPTIONS as DEFAULT
+from bson.codec_options import CodecOptions
 from bson.son import SON