update travis matrix
update travis matrix

Whitelist less common combinations, rather than blacklist.
swn1/pyzmq,yyt030/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,yyt030/pyzmq,yyt030/pyzmq,dash-dash/pyzmq,Mustard-Systems-Ltd/pyzmq,ArvinPan/pyzmq,dash-dash/pyzmq,ArvinPan/pyzmq,caidongyun/pyzmq,caidongyun/pyzmq,caidongyun/pyzmq,Mustard-Systems-Ltd/pyzmq,swn1/pyzmq,swn1/pyzmq