Package setuptools is required when using thinc

[patrik7812]

Python package 'setuptools' is reguired to be installed when using thinc.
This package should not be included as a requirement for installation, but only for development.

[rgommers]

That looks right, it's unused and can be removed from

thinc/setup.cfg

Line 49 in 6c38b29

setuptools

as far as I can tell.