add install_requires for pypy
add install_requires for pypy

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