add import get_texts_and_offsets_from_bioc_ann (#3)

- add import get_texts_and_offsets_from_bioc_ann (2f34024d6ba84bee5fdbd77229be9ece213e892e)

bc5cdr.py

@@ -32,6 +32,8 @@ from bioc import biocxml
 from .bigbiohub import kb_features
 from .bigbiohub import BigBioConfig
 from .bigbiohub import Tasks
+from .bigbiohub import get_texts_and_offsets_from_bioc_ann
+
 
 _LANGUAGES = ['English']
 _PUBMED = True