tox.ini: Don't use pydocstyle 2.0.0
tox.ini: Don't use pydocstyle 2.0.0

pydocstyle 2.0.0 is not compatible with flake8-docstrings.

Bug: T163293
Change-Id: Ibf2996dfed11b30ac11aa55b629f15ba83d282ea

magul/pywikibot-core,Darkdadaah/pywikibot-core,jayvdb/pywikibot-core,npdoty/pywikibot,Darkdadaah/pywikibot-core,wikimedia/pywikibot-core,npdoty/pywikibot,PersianWikipedia/pywikibot-core,hasteur/g13bot_tools_new,magul/pywikibot-core,hasteur/g13bot_tools_new,jayvdb/pywikibot-core,hasteur/g13bot_tools_new,happy5214/pywikibot-core,wikimedia/pywikibot-core,happy5214/pywikibot-core