description-file in setup.cfg

[anambiar7200]

I get the following error when trying to build fastapi-camelcase.

      setuptools.errors.InvalidConfigError: Invalid dash-separated key
      'description-file' in 'metadata' (setup.cfg), please use the underscore
      name 'description_file' instead.

I believe description-file needs to be changed to description_file

See #25

[jayesef]

I get the same issue and would have thought of the same solution