Breaks manage.py in Django projects using django-dotenv

[glenvaughan]

For Django projects using django-dotenv and calling dotenv.read_dotenv() from manage.py, installing this library will break manage.py due to a namespace conflict between django-dotenv and python-dotenv (a dependency that this library will install). I know this isn't a Django-specific library and that it would be outside of scope to try to resolve this issue, but might at least be worth a warning in the README.