raft: add features section to readme file
raft: add features section to readme file

rnaveiras/etcd,ajityagaty/etcd,mqliang/etcd,dannysauer/etcd,wantonsolutions/dinv-etcd,ajityagaty/etcd,ktateish/etcd,glevand/coreos--etcd,linuxcer/etcd,wantonsolutions/dinv-etcd,purpleidea/etcd,jlamillan/etcd,visheshnp/etcd,bluebreezecf/etcd,gyuho/etcd,OyTao/etcd_learning,rnaveiras/etcd,yudai/etcd,glycerine/etcd,swingbach/etcd,li-ang/etcd,mickep76/etcd,whuwxl/etcd,sebrandon1/etcd,insequent/etcd,armstrongli/etcd,lorneli/etcd,li-ang/etcd,bdarnell/etcd,a-robinson/etcd,StorReduce/etcd,etcd-io/etcd,heyitsanthony/etcd,luxas/etcd,vimalk78/etcd,endocode/etcd,rchicoli/etcd,westhood/etcd,mkumatag/etcd,jlamillan/etcd,ravigadde/etcd,linuxcer/etcd,akauppi/etcd,handsomesun/etcd,YuleiXiao/etcd,sebrandon1/etcd,yudai/etcd,hongchaodeng/etcd,sinsharat/etcd,lumjjb/etcd,nekto0n/etcd,plasticbox/etcd,joshix/etcd,insequent/etcd,fanminshi/etcd,heyitsanthony/etcd,armstrongli/etcd,qqsun8819/etcd,CrazyJvm/etcd,dannysauer/etcd,ktateish/etcd,zaphod-concur/etcd,glycerine/etcd,coreos/etcd,rnaveiras/etcd,mqliang/etcd,jonboulle/etcd,a-robinson/etcd,endocode/etcd,xiang90/etcd,whuwxl/etcd,etcd-io/etcd,swingbach/etcd,sinsharat/etcd,nekto0n/etcd,ajityagaty/etcd,xiang90/etcd,purpleidea/etcd,fanminshi/etcd,etcd-io/etcd,lumjjb/etcd,wantonsolutions/dinv-etcd,jonboulle/etcd,handsomesun/etcd,hongchaodeng/etcd,StorReduce/etcd,tguangch/etcd,YuleiXiao/etcd,westhood/etcd,ravigadde/etcd,mickep76/etcd,mkumatag/etcd,akauppi/etcd,cockroachdb/etcd,bluebreezecf/etcd,plasticbox/etcd,zaphod-concur/etcd,qqsun8819/etcd,CrazyJvm/etcd,OyTao/etcd_learning,glevand/coreos--etcd,gyuho/etcd,coreos/etcd,luxas/etcd,rchicoli/etcd,tguangch/etcd,cockroachdb/etcd,lorneli/etcd,mkumatag/etcd,joshix/etcd,visheshnp/etcd,bdarnell/etcd,mqliang/etcd,vimalk78/etcd