How to customize lemmatization in spaCy 2.2+ is explained in this notebook:
Spacy Lemma Correction with Lookups Data.ipynb
See also: explosion/spaCy#2668
Pull Request: https://github.com/explosion/spacy-lookups-data/pulls?utf8=%E2%9C%93&q=is%3Apr+author%3Ajsalbr
Alternatives for lemmatization: