Change the readthedoc link to mxnet.io in readme.md (#3418)
Change the readthedoc link to mxnet.io in readme.md (#3418)


lxn2/mxnet,vikingMei/mxnet,sergeykolychev/mxnet,hotpxl/mxnet,ptrendx/mxnet,arank/mxnet,fullfanta/mxnet,tornadomeet/mxnet,lxn2/mxnet,sxjscience/mxnet,nicklhy/mxnet,EvanzzzZ/mxnet,DR08/mxnet,precedenceguo/mxnet,stefanhenneking/mxnet,Guneet-Dhillon/mxnet,smolix/incubator-mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,gautamkmr/incubator-mxnet,likelyzhao/mxnet,madjam/mxnet,yuruofeifei/mxnet,formath/mxnet,thirdwing/mxnet,tlby/mxnet,smolix/incubator-mxnet,arank/mxnet,ykim362/mxnet,jiajiechen/mxnet,jamesliu/mxnet,Ldpe2G/mxnet,danithaca/mxnet,tornadomeet/mxnet,jermainewang/mxnet,danithaca/mxnet,hotpxl/mxnet,kkk669/mxnet,TuSimple/mxnet,eric-haibin-lin/mxnet,fullfanta/mxnet,smolix/incubator-mxnet,mbaijal/incubator-mxnet,gautamkmr/incubator-mxnet,CodingCat/mxnet,reminisce/mxnet,wangyum/mxnet,apache/incubator-mxnet,DR08/mxnet,piiswrong/mxnet,LinkHS/incubator-mxnet,apaleyes/mxnet,jermainewang/mxnet,zhreshold/mxnet,jamesliu/mxnet,rishita/mxnet,Northrend/mxnet,tlby/mxnet,Guneet-Dhillon/mxnet,xcgoner/dist-mxnet,jermainewang/mxnet,EvanzzzZ/mxnet,rahul003/mxnet,leezu/mxnet,Guneet-Dhillon/mxnet,ykim362/mxnet,likelyzhao/mxnet,kevinthesun/mxnet,jermainewang/mxnet,ZihengJiang/mxnet,ZihengJiang/mxnet,zhreshold/mxnet,apache/incubator-mxnet,rishita/mxnet,DR08/mxnet,ZihengJiang/mxnet,larroy/mxnet,jiajiechen/mxnet,rahul003/mxnet,madjam/mxnet,coder-james/mxnet,reminisce/mxnet,navrasio/mxnet,antoan2/incubator-mxnet,reminisce/mxnet,hpi-xnor/BMXNet,jennyzhang0215/incubator-mxnet,solin319/incubator-mxnet,leezu/mxnet,crazy-cat/incubator-mxnet,ykim362/mxnet,apaleyes/mxnet,yajiedesign/mxnet,hpi-xnor/BMXNet,EvanzzzZ/mxnet,ykim362/mxnet,larroy/mxnet,reminisce/mxnet,apaleyes/mxnet,wangyum/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,jermainewang/mxnet,stefanhenneking/mxnet,zhreshold/mxnet,kkk669/mxnet,dmlc/mxnet,jiajiechen/mxnet,solin319/incubator-mxnet,leezu/mxnet,eric-haibin-lin/mxnet,formath/mxnet,gautamkmr/incubator-mxnet,larroy/mxnet,vikingMei/mxnet,kevinthesun/mxnet,ptrendx/mxnet,ptrendx/mxnet,crazy-cat/incubator-mxnet,leezu/mxnet,rishita/mxnet,dmlc/mxnet,fullfanta/mxnet,formath/mxnet,fullfanta/mxnet,crazy-cat/incubator-mxnet,apaleyes/mxnet,sergeykolychev/mxnet,CodingCat/mxnet,arank/mxnet,piiswrong/mxnet,apaleyes/mxnet,likelyzhao/mxnet,TuSimple/mxnet,antoan2/incubator-mxnet,TuSimple/mxnet,nicklhy/mxnet,lxn2/mxnet,ForkedReposBak/mxnet,rahul003/mxnet,indhub/mxnet,apaleyes/mxnet,danithaca/mxnet,hotpxl/mxnet,antoan2/incubator-mxnet,madjam/mxnet,madjam/mxnet,jennyzhang0215/incubator-mxnet,sergeykolychev/mxnet,hpi-xnor/BMXNet,hotpxl/mxnet,wangyum/mxnet,LinkHS/incubator-mxnet,arank/mxnet,arikpoz/mxnet,Mega-DatA-Lab/mxnet,reminisce/mxnet,ptrendx/mxnet,navrasio/mxnet,formath/mxnet,precedenceguo/mxnet,apache/incubator-mxnet,EvanzzzZ/mxnet,likelyzhao/mxnet,hpi-xnor/BMXNet,pluskid/mxnet,hesseltuinhof/mxnet,DickJC123/mxnet,sxjscience/mxnet,hotpxl/mxnet,likelyzhao/mxnet,ykim362/mxnet,ShownX/incubator-mxnet,sergeykolychev/mxnet,crazy-cat/incubator-mxnet,Prasad9/incubator-mxnet,formath/mxnet,sergeykolychev/mxnet,arikpoz/mxnet,mbaijal/incubator-mxnet,navrasio/mxnet,crazy-cat/incubator-mxnet,formath/mxnet,jamesliu/mxnet,Mega-DatA-Lab/mxnet,saurabh3949/mxnet,fullfanta/mxnet,yajiedesign/mxnet,dmlc/mxnet,Guneet-Dhillon/mxnet,jiajiechen/mxnet,indhub/mxnet,Guneet-Dhillon/mxnet,thirdwing/mxnet,hpi-xnor/BMXNet,madjam/mxnet,jamesliu/mxnet,crazy-cat/incubator-mxnet,ykim362/mxnet,nicklhy/mxnet,stefanhenneking/mxnet,coder-james/mxnet,LinkHS/incubator-mxnet,TuSimple/mxnet,indhub/mxnet,jiajiechen/mxnet,hpi-xnor/BMXNet,antoan2/incubator-mxnet,piiswrong/mxnet,thirdwing/mxnet,yuruofeifei/mxnet,stefanhenneking/mxnet,kevinthesun/mxnet,ForkedReposBak/mxnet,luoyetx/mxnet,Prasad9/incubator-mxnet,smolix/incubator-mxnet,leezu/mxnet,weleen/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,Ldpe2G/mxnet,vikingMei/mxnet,vikingMei/mxnet,hesseltuinhof/mxnet,tlby/mxnet,precedenceguo/mxnet,solin319/incubator-mxnet,navrasio/mxnet,lxn2/mxnet,ShownX/incubator-mxnet,navrasio/mxnet,solin319/incubator-mxnet,yajiedesign/mxnet,Mega-DatA-Lab/mxnet,Ldpe2G/mxnet,vikingMei/mxnet,eric-haibin-lin/mxnet,piiswrong/mxnet,xcgoner/dist-mxnet,indhub/mxnet,zhreshold/mxnet,xcgoner/dist-mxnet,tornadomeet/mxnet,weleen/mxnet,jamesliu/mxnet,jamesliu/mxnet,leezu/mxnet,luoyetx/mxnet,arikpoz/mxnet,madjam/mxnet,kkk669/mxnet,nicklhy/mxnet,rahul003/mxnet,Mega-DatA-Lab/mxnet,piiswrong/mxnet,kevinthesun/mxnet,solin319/incubator-mxnet,EvanzzzZ/mxnet,ykim362/mxnet,hpi-xnor/BMXNet,indhub/mxnet,szha/mxnet,saurabh3949/mxnet,xcgoner/dist-mxnet,stefanhenneking/mxnet,jiajiechen/mxnet,arank/mxnet,stefanhenneking/mxnet,precedenceguo/mxnet,mbaijal/incubator-mxnet,TuSimple/mxnet,TuSimple/mxnet,jamesliu/mxnet,szha/mxnet,formath/mxnet,solin319/incubator-mxnet,Ldpe2G/mxnet,szha/mxnet,ZihengJiang/mxnet,Mega-DatA-Lab/mxnet,thirdwing/mxnet,dmlc/mxnet,DR08/mxnet,TuSimple/mxnet,Ldpe2G/mxnet,solin319/incubator-mxnet,piiswrong/mxnet,antoan2/incubator-mxnet,piiswrong/mxnet,formath/mxnet,precedenceguo/mxnet,xcgoner/dist-mxnet,reminisce/mxnet,DR08/mxnet,szha/mxnet,weleen/mxnet,kevinthesun/mxnet,DickJC123/mxnet,Northrend/mxnet,larroy/mxnet,luoyetx/mxnet,CodingCat/mxnet,jiajiechen/mxnet,wangyum/mxnet,Northrend/mxnet,luoyetx/mxnet,smolix/incubator-mxnet,eric-haibin-lin/mxnet,eric-haibin-lin/mxnet,wangyum/mxnet,smolix/incubator-mxnet,ShownX/incubator-mxnet,ptrendx/mxnet,thirdwing/mxnet,lxn2/mxnet,hotpxl/mxnet,saurabh3949/mxnet,kkk669/mxnet,Ldpe2G/mxnet,precedenceguo/mxnet,hotpxl/mxnet,Northrend/mxnet,coder-james/mxnet,arikpoz/mxnet,kevinthesun/mxnet,kevinthesun/mxnet,navrasio/mxnet,luoyetx/mxnet,ForkedReposBak/mxnet,coder-james/mxnet,gautamkmr/incubator-mxnet,hpi-xnor/BMXNet,eric-haibin-lin/mxnet,leezu/mxnet,jennyzhang0215/incubator-mxnet,smolix/incubator-mxnet,pluskid/mxnet,crazy-cat/incubator-mxnet,eric-haibin-lin/mxnet,hesseltuinhof/mxnet,thirdwing/mxnet,precedenceguo/mxnet,weleen/mxnet,kkk669/mxnet,jiajiechen/mxnet,navrasio/mxnet,EvanzzzZ/mxnet,leezu/mxnet,CodingCat/mxnet,yajiedesign/mxnet,rishita/mxnet,larroy/mxnet,likelyzhao/mxnet,xcgoner/dist-mxnet,saurabh3949/mxnet,EvanzzzZ/mxnet,CodingCat/mxnet,apaleyes/mxnet,jennyzhang0215/incubator-mxnet,yajiedesign/mxnet,fullfanta/mxnet,larroy/mxnet,luoyetx/mxnet,Mega-DatA-Lab/mxnet,szha/mxnet,CodingCat/mxnet,rishita/mxnet,zhreshold/mxnet,Prasad9/incubator-mxnet,piiswrong/mxnet,madjam/mxnet,vikingMei/mxnet,ptrendx/mxnet,sergeykolychev/mxnet,ZihengJiang/mxnet,CodingCat/mxnet,sergeykolychev/mxnet,reminisce/mxnet,kevinthesun/mxnet,hotpxl/mxnet,rahul003/mxnet,kkk669/mxnet,saurabh3949/mxnet,reminisce/mxnet,stefanhenneking/mxnet,piiswrong/mxnet,szha/mxnet,LinkHS/incubator-mxnet,leezu/mxnet,jermainewang/mxnet,thirdwing/mxnet,wangyum/mxnet,tornadomeet/mxnet,arank/mxnet,jennyzhang0215/incubator-mxnet,CodingCat/mxnet,saurabh3949/mxnet,Guneet-Dhillon/mxnet,ShownX/incubator-mxnet,hesseltuinhof/mxnet,jiajiechen/mxnet,EvanzzzZ/mxnet,kevinthesun/mxnet,Guneet-Dhillon/mxnet,Guneet-Dhillon/mxnet,apache/incubator-mxnet,rahul003/mxnet,nicklhy/mxnet,ForkedReposBak/mxnet,hesseltuinhof/mxnet,yuruofeifei/mxnet,arikpoz/mxnet,madjam/mxnet,xcgoner/dist-mxnet,LinkHS/incubator-mxnet,danithaca/mxnet,fullfanta/mxnet,antoan2/incubator-mxnet,rishita/mxnet,indhub/mxnet,dmlc/mxnet,nicklhy/mxnet,weleen/mxnet,yuruofeifei/mxnet,ForkedReposBak/mxnet,danithaca/mxnet,ShownX/incubator-mxnet,weleen/mxnet,solin319/incubator-mxnet,crazy-cat/incubator-mxnet,saurabh3949/mxnet,Ldpe2G/mxnet,saurabh3949/mxnet,Prasad9/incubator-mxnet,coder-james/mxnet,indhub/mxnet,ptrendx/mxnet,ptrendx/mxnet,tlby/mxnet,precedenceguo/mxnet,pluskid/mxnet,Prasad9/incubator-mxnet,mbaijal/incubator-mxnet,ZihengJiang/mxnet,wangyum/mxnet,Northrend/mxnet,fullfanta/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,tornadomeet/mxnet,coder-james/mxnet,rahul003/mxnet,formath/mxnet,thirdwing/mxnet,rishita/mxnet,saurabh3949/mxnet,Guneet-Dhillon/mxnet,lxn2/mxnet,arank/mxnet,yuruofeifei/mxnet,arank/mxnet,Mega-DatA-Lab/mxnet,Northrend/mxnet,DickJC123/mxnet,Northrend/mxnet,indhub/mxnet,lxn2/mxnet,larroy/mxnet,szha/mxnet,navrasio/mxnet,tornadomeet/mxnet,mbaijal/incubator-mxnet,pluskid/mxnet,lxn2/mxnet,vikingMei/mxnet,sergeykolychev/mxnet,yuruofeifei/mxnet,tornadomeet/mxnet,Ldpe2G/mxnet,jennyzhang0215/incubator-mxnet,xcgoner/dist-mxnet,madjam/mxnet,DR08/mxnet,nicklhy/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,arikpoz/mxnet,wangyum/mxnet,dmlc/mxnet,yajiedesign/mxnet,gautamkmr/incubator-mxnet,tlby/mxnet,tlby/mxnet,jennyzhang0215/incubator-mxnet,indhub/mxnet,lxn2/mxnet,szha/mxnet,tlby/mxnet,weleen/mxnet,TuSimple/mxnet,danithaca/mxnet,Prasad9/incubator-mxnet,reminisce/mxnet,ZihengJiang/mxnet,precedenceguo/mxnet,nicklhy/mxnet,ForkedReposBak/mxnet,EvanzzzZ/mxnet,antoan2/incubator-mxnet,stefanhenneking/mxnet,vikingMei/mxnet,likelyzhao/mxnet,likelyzhao/mxnet,dmlc/mxnet,tlby/mxnet,hesseltuinhof/mxnet,crazy-cat/incubator-mxnet,danithaca/mxnet,pluskid/mxnet,rahul003/mxnet,apaleyes/mxnet,hotpxl/mxnet,TuSimple/mxnet,wangyum/mxnet,larroy/mxnet,smolix/incubator-mxnet,luoyetx/mxnet,DR08/mxnet,arank/mxnet,larroy/mxnet,tlby/mxnet,hesseltuinhof/mxnet,kkk669/mxnet,tornadomeet/mxnet,sergeykolychev/mxnet,ykim362/mxnet,yajiedesign/mxnet,apaleyes/mxnet,coder-james/mxnet,DickJC123/mxnet,mbaijal/incubator-mxnet,rishita/mxnet,Mega-DatA-Lab/mxnet,ForkedReposBak/mxnet,tlby/mxnet,weleen/mxnet,coder-james/mxnet,fullfanta/mxnet,Prasad9/incubator-mxnet,CodingCat/mxnet,Prasad9/incubator-mxnet,ShownX/incubator-mxnet,dmlc/mxnet,danithaca/mxnet,luoyetx/mxnet,sxjscience/mxnet,DR08/mxnet,sxjscience/mxnet,Ldpe2G/mxnet,LinkHS/incubator-mxnet,szha/mxnet,yuruofeifei/mxnet,nicklhy/mxnet,ykim362/mxnet,mbaijal/incubator-mxnet,thirdwing/mxnet,kkk669/mxnet,TuSimple/mxnet,hpi-xnor/BMXNet,xcgoner/dist-mxnet,pluskid/mxnet,jennyzhang0215/incubator-mxnet,ptrendx/mxnet,gautamkmr/incubator-mxnet,antoan2/incubator-mxnet,pluskid/mxnet,ShownX/incubator-mxnet,mbaijal/incubator-mxnet,jermainewang/mxnet,arikpoz/mxnet,stefanhenneking/mxnet,luoyetx/mxnet,LinkHS/incubator-mxnet,likelyzhao/mxnet,Prasad9/incubator-mxnet,zhreshold/mxnet,danithaca/mxnet,Northrend/mxnet,LinkHS/incubator-mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,reminisce/mxnet,kkk669/mxnet,jamesliu/mxnet,ZihengJiang/mxnet,coder-james/mxnet,ShownX/incubator-mxnet,ZihengJiang/mxnet,DR08/mxnet,jennyzhang0215/incubator-mxnet,weleen/mxnet,smolix/incubator-mxnet,navrasio/mxnet,yuruofeifei/mxnet,jamesliu/mxnet,vikingMei/mxnet,sxjscience/mxnet,pluskid/mxnet,yuruofeifei/mxnet,arikpoz/mxnet,tornadomeet/mxnet,sxjscience/mxnet,solin319/incubator-mxnet,antoan2/incubator-mxnet,Northrend/mxnet,Mega-DatA-Lab/mxnet,rishita/mxnet,jermainewang/mxnet,ShownX/incubator-mxnet,zhreshold/mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,jermainewang/mxnet,ptrendx/mxnet,dmlc/mxnet,pluskid/mxnet,hesseltuinhof/mxnet,arikpoz/mxnet,rahul003/mxnet,gautamkmr/incubator-mxnet,hesseltuinhof/mxnet