root/pypi: links for aiidalab-widgets-base

root/pypi aiidalab-widgets-base-0.3.0b1.tar.gz
root/pypi aiidalab_widgets_base-0.3.0b1-py2-none-any.whl
root/pypi aiidalab_widgets_base-0.2.0a2-py2.py3-none-any.whl