[appveyor] stop deploy on github
[appveyor] stop deploy on github

SheffieldML/GPy,mikecroucher/GPy,befelix/GPy,dhhjx880713/GPy,befelix/GPy,esiivola/GPYgradients,ysekky/GPy,ysekky/GPy,dhhjx880713/GPy,esiivola/GPYgradients,ysekky/GPy,dhhjx880713/GPy,esiivola/GPYgradients,esiivola/GPYgradients,mikecroucher/GPy,befelix/GPy,SheffieldML/GPy,dhhjx880713/GPy,befelix/GPy,mikecroucher/GPy,mikecroucher/GPy,ysekky/GPy,SheffieldML/GPy,SheffieldML/GPy