Installing from source is broken

When installing from the source distribution (.tar.gz) rather than the wheel, there is an error due to the readme.md not being in the source distribution:

pip install --no-binary :all: whatlies

Complete output (11 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/ld/gx_8s3_n25g1dkhj59zjlxww0000gn/T/pip-install-j1jgucid/whatlies_d4b383e945574b47b346e62542fc3c0d/setup.py", line 67, in <module>
        long_description=pathlib.Path("readme.md").read_text(),
      File "/Users/xyz/miniconda2/envs/foo/lib/python3.9/pathlib.py", line 1266, in read_text
        with self.open(mode='r', encoding=encoding, errors=errors) as f:
      File "/Users/xyz/miniconda2/envs/foo/lib/python3.9/pathlib.py", line 1252, in open
        return io.open(self, mode, buffering, encoding, errors, newline,
      File "/Users/xyz/miniconda2/envs/foo/lib/python3.9/pathlib.py", line 1120, in _opener
        return self._accessor.open(self, flags, mode)
    FileNotFoundError: [Errno 2] No such file or directory: 'readme.md'

I would recommend adding a MANIFEST.in file to specify that the readme is included: https://packaging.python.org/guides/using-manifest-in/

[synapticarbors]

I think that should work

[sugatoray]

@koaning I had started packaging whatlies for conda-forge and this error happened there. Thanks to @synapticarbors, the root-cause of this error was identified and then it got fixed. The build just passed with the base requirements of whatlies.