`git clone` needs to be `--recursive`

[SirNate0]

The readme and docs suggest just git clone https://github.com/PyEllips/pyElli but it needs to have the --recursive option or the refractive index info database will not work when installing with pip install -e . or pip install -e ".[fitting]".

[domna]

Hey @SirNate0,

thank you! You are right, we added the submodule after we created the readme and forgot to update it there. I'll update it