add the requirement for cuDNN version in README
add the requirement for cuDNN version in README

lcy-seso/models,lcy-seso/models,kuke/models,Superjom/models-1,qingqing01/models,lcy-seso/models,xinghai-sun/models,PaddlePaddle/models,Superjom/models-1,xinghai-sun/models,PaddlePaddle/models,xinghai-sun/models,Superjom/models-1,xinghai-sun/models,qingqing01/models,qingqing01/models,kuke/models,PaddlePaddle/models,kuke/models,kuke/models