Error this addresses:
File "/Users/lucas/Documents/usds/repos/justice40-tool/data/data-pipeline/data_pipeline/etl/runner.py", line 71, in etl_runner
f"data_pipeline.etl.sources.{dataset['module_dir']}.etl"
TypeError: 'NoneType' object is not subscriptable
* Fixes#456 - Our data directory should adopt standard python package structure
* a few missed references
* updating readme
* updating requirements
* Running Black
* Fixes for flake8
* updating pylint