non-existent package in requirements.txt?

django_admin_listfilter_dropdown was recently added to requirements.txt. So far as I can find, this is not an existent conda package, nor is there anything with a similar name. I did find what appears to be the correct package available via pip with a slightlly different name: django-admin-list-filter-dropdown. 

As a result of this missing requirement, docker-compose fails.