Anki add-on: Sanseido Definitions Python3 Anki2.1

Port of https://ankiweb.net/shared/info/1967553085 compatible with Python 3 and Anki 2.1 Put in a folder inside addons21 e.g. addons21/sanseido/ __init__.py Make sure you have beautifulsoup4 installed (pip3 install beautifulsoup4).