Added setup.cfg to .gitignore.
Added setup.cfg to .gitignore.

Mustard-Systems-Ltd/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,yyt030/pyzmq,ArvinPan/pyzmq,swn1/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,swn1/pyzmq,dash-dash/pyzmq,caidongyun/pyzmq,Mustard-Systems-Ltd/pyzmq,dash-dash/pyzmq,yyt030/pyzmq,caidongyun/pyzmq