loongson/pypi: links for flask-bootstrap4

loongson/mirror Flask-Bootstrap4-4.0.2.tar.gz
loongson/mirror Flask_Bootstrap4-4.0.2-py3-none-any.whl
loongson/mirror Flask-Bootstrap4-4.0.1.tar.gz
loongson/mirror Flask_Bootstrap4-4.0.1-py3-none-any.whl
loongson/mirror Flask-Bootstrap4-4.0.0.tar.gz
loongson/mirror Flask_Bootstrap4-4.0.0-py3-none-any.whl