require setuptools at setup (#673)
require setuptools at setup (#673)

* require setuptools at setup

* Update setup.py

AMICI-developer/AMICI,AMICI-developer/AMICI,FFroehlich/AMICI,AMICI-developer/AMICI,FFroehlich/AMICI,FFroehlich/AMICI,AMICI-developer/AMICI,FFroehlich/AMICI