setup.py: Require version 18.0 of `setuptools` or higher.
setup.py: Require version 18.0 of `setuptools` or higher.

jakirkham/rank_filter,nanshe-org/rank_filter,jakirkham/rank_filter,jakirkham/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter,DudLab/rank_filter,DudLab/rank_filter,nanshe-org/rank_filter