realworld/dev: links for django-viewflow-pro

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

realworld/dev django-viewflow-pro-1.6.2.tar.gz
realworld/dev django_viewflow_pro-1.6.2-py2.py3-none-any.whl
realworld/dev django-viewflow-pro-1.3.0.tar.gz
realworld/dev django-viewflow-pro-1.2.1.tar.gz