Code refactoring to expose the [Doc](https://spacy.io/api/doc) object produced by spaCy.
Only available when taxonerd is used as a python module.
python
>>> from taxonerd import TaxoNERD
>>> ner = TaxoNERD(model="en_ner_eco_md", prefer_gpu=False, with_abbrev=False)
>>> doc = ner.ner("Brown bears (Ursus arctos), which are widely distributed throughout the northern hemisphere, are recognised as opportunistic omnivore")
>>> print([ent for ent in doc.ents])
[Ursus arctos]