updated to 2.3.1, as 2.3.0 is not from master branch.

bump to 2.2.0

bump to 2.1.0

updated README and docstring

make mypy and pylint pass (#11)

* pylint fix for ncbitax2lin/data_io.py

* pylint fix for ncbitax2lin/__init__.py

* pylint fix for ncbitax2lin/ncbitax2lin.py

* added autoflake poetry.lock

* added mypy.ini pylintrc

* pylint utils.py

* bump to 2.0.2

* update

adopted poetry, modernized the code (Python-3.7, typing, etc.)

updated README.md

updated README.md, ftp url isn't rendered on github