added missing library to pip-requirements.txt
added missing library to pip-requirements.txt

pajlada/tyggbot,pajlada/pajbot,gigglearrows/anniesbot,pajlada/tyggbot,pajlada/pajbot,pajlada/pajbot,pajlada/pajbot,gigglearrows/anniesbot,pajlada/tyggbot,gigglearrows/anniesbot,pajlada/tyggbot